MAX6622UE9A+-MAX6622UE9A+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX6622UE9A+T ,5-Channel Precision Temperature MonitorELECTRICAL CHARACTERISTICS(V = +3.0V to +5.5V, V = V , T = -40°C to +125°C, unless otherwise noted. ..
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MAX6622UE9A+-MAX6622UE9A+T
5-Channel Precision Temperature Monitor
General Description
The MAX6622 precision multichannel temperature sen-
sor monitors its own temperature and the temperatures
of up to four external diode-connected transistors. All
temperature channels have programmable alert thresh-
olds. Channels 1 and 4 also have programmable
overtemperature thresholds. When the measured tem-
perature of a channel exceeds the respective thresh-
old, a status bit is set in one of the status registers. Two
open-drain outputs, OVERTand ALERT, assert corre-
sponding to these bits in the status register.
The 2-wire serial interface supports the standard system
management bus (SMBus™) protocols: write byte, read
byte, send byte, and receive byte for reading the tem-
perature data and programming the alarm thresholds.
The MAX6622 is specified for a -40°C to +125°C oper-
ating temperature range and is available in a 16-pin
TSSOP package.
Applications
Desktop Computers
Notebook Computers
Workstations
Servers
FeaturesFour Thermal-Diode InputsLocal Temperature Sensor1°C Remote Temperature Accuracy (+60°C to +100°C)Temperature Monitoring Begins at POR for Fail-
Safe System ProtectionALERTand OVERTOutputs for Interrupts,
Throttling, and ShutdownSTBYInput for Hardware Standby ModeSmall, 16-Pin TSSOP Package2-Wire SMBus InterfacePenryn CPU-CompatiblePin- and Register-Compatible with MAX6602
MAX6622
5-Channel Precision Temperature Monitor
Ordering Information
GND
SMBCLK
SMBDATA
DXN2
DXP2
DXN1
DXP1
VCC
N.C.
STBYDXN4
DXP4
DXN3
DXP3
MAX6622
ALERT
OVERT
2200pF
2200pF
2200pF
2200pF
CPU
0.1μF
TO SYSTEM
SHUTDOWN
INTERRUPT
TO μP
DATA
CLK
4.7kΩ
EACH
+3.3V
Typical Application Circuit
19-3003; Rev 0; 12/07
PARTPIN-
PACKAGE
SLAVE
ADDRESS
PKG
CODE
MAX6622UE9A+16 TSSOP1001 101U16-1
SMBus is a trademark of Intel Corp.
Note: This device is specified over the -40°C to +125°C
temperature range.
+Denotes lead-free package.
Pin Configuration appears at end of data sheet.
MAX6622
5-Channel Precision Temperature Monitor
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VCC, SMBCLK, SMBDATA, ALERT, OVERT,
STBYto GND .......................................................-0.3V to +6V
DXP_ to GND..............................................-0.3V to (VCC+ 0.3V)
DXN2, DXN3, DXN4 to GND.................................-0.3V to +0.8V
SMBDATA, ALERT, OVERTCurrent....................-1mA to +50mA
DXN Current.......................................................................±1mA
Continuous Power Dissipation (TA= +70°C)
16-Pin TSSOP
(derate 11.1mW/°C above +70°C)..............................888.9mW
Junction-to-Case Thermal Resistance (θJC) (Note A)
16-Pin TSSOP ..............................................................27°C/W
Junction-to-Ambient Thermal Resistance (θJA) (Note A)
16-Pin TSSOP...............................................................90°C/W
ESD Protection (all pins, Human Body Model)................±2000V
Operating Temperature Range.........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-60°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
ELECTRICAL CHARACTERISTICS
(VCC= +3.0V to +5.5V, VSTBY= VCC, TA= -40°C to +125°C, unless otherwise noted. Typical values are at VCC= +3.3V and= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Supply VoltageVCC3.05.5V
Software Standby Supply CurrentISSSMBus static30µA
Operating CurrentICCDuring conversion5001000µA
Channel 1 only11Temperature ResolutionOther diode channels8Bits
TA = TRJ = +60°C to +100°C-1.0+1.0Remote Temperature AccuracyVCC = 3.3VTA = TRJ = 0°C to +125°C-3.0+3.0C
TA = +60°C to +100°C-4.4-0.4Local Temperature AccuracyVCC = 3.3VTA = 0°C to +125°C-6.1-0.1C
Supply Sensitivity of Temperature
Accuracy±0.2oC/V
Resistance cancellation off95125156Remote Channel 1 Conversion
TimetCONV1Resistance cancellation on190250312ms
Remote Channels 2 Through 4
Conversion TimetCONV_95125156ms
High level80100120Remote-Diode Source CurrentIRJLow level81012µA
Undervoltage-Lockout ThresholdUVLOFalling edge of VCC disables ADC2.302.802.95V
Undervoltage-Lockout Hysteresis90mV
Power-On-Reset (POR) ThresholdVCC falling edge1.22.02.5V
POR Threshold Hysteresis90mV
ALERT, OVERT
ISINK = 1mA0.3Output Low VoltageVOLISINK = 6mA0.5V
Output Leakage Current1µA
Note A:Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a
4-layer board. For detailed information on package thermal considerations, refer to Application Note 4083available
at /thermal-tutorial.
MAX6622
5-Channel Precision Temperature Monitor
ELECTRICAL CHARACTERISTICS (continued)
(VCC= +3.0V to +5.5V, VSTBY= VCC, TA= -40°C to +125°C, unless otherwise noted. Typical values are at VCC= +3.3V and= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
SMBus INTERFACE (SCL, SDA), STBY
Logic Input Low VoltageVIL0.8V
VCC = 3.0V2.2Logic Input High VoltageVIHVCC = 5.0V2.4V
Input Leakage Current-1+1µA
Output Low VoltageVOLISINK = 6mA0.3V
Input CapacitanceCIN5pF
SMBus-COMPATIBLE TIMING (Figures 3 and 4) (Note 2)
Serial-Clock FrequencyfSCL(Note 3)400kHz
fSCL = 100kHz4.7Bus Free Time Between STOP
and START ConditiontBUFfSCL = 400kHz1.6µs
fSCL = 100kHz4.7START Condition Setup TimefSCL = 400kHz0.6µs
90% of SCL to 90% of SDA,
fSCL = 100kHz0.6
Repeat START Condition Setup
TimetSU:STA
90% of SCL to 90% of SDA,
fSCL = 400kHz0.6
START Condition Hold TimetHD:STA10% of SDA to 90% of SCL0.6µs
90% of SCL to 90% of SDA,
fSCL = 100kHz4
STOP Condition Setup TimetSU:STO
90% of SCL to 90% of SDA,
fSCL = 400kHz0.6
10% to 10%, fSCL = 100kHz1.3Clock Low PeriodtLOW10% to 10%, fSCL = 400kHz1.3µs
Clock High PeriodtHIGH90% to 90%0.6µs
fSCL = 100kHz300Data Hold TimetHD:DATfSCL = 400kHz (Note 4)900ns
fSCL = 100kHz250Data Setup TimetSU:DATfSCL = 400kHz100ns
fSCL = 100kHz1Receive SCL/SDA Rise TimetRfSCL = 400kHz0.3µs
Receive SCL/SDA Fall TimetF300ns
Pulse Width of Spike SuppressedtSP050ns
SMBus TimeouttTIMEOUTSDA low period for interface reset253745ms
Note 1:All parameters are tested at TA= +85°C. Specifications over temperature are guaranteed by design.
Note 2:Timing specifications are guaranteed by design.
Note 3:The serial interface resets when SCL is low for more than tTIMEOUT.
Note 4:A transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SCL’s falling edge.
MAX6622
5-Channel Precision Temperature Monitor
Typical Operating Characteristics
(VCC= 3.3V, VSTBY= VCC, TA= +25°C, unless otherwise noted.)
SOFTWARE STANDBY SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6622 toc01
SUPPLY VOLTAGE (V)
STANDBY SUPPLY CURRENT (
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6622 toc02
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
REMOTE TEMPERATURE ERROR
vs. REMOTE-DIODE TEMPERATURE
MAX6622 toc03
REMOTE-DIODE TEMPERATURE (°C)
TEMPERATURE ERROR (255075100125
LOCAL TEMPERATURE ERROR
vs. DIE TEMPERATURE
MAX6622 toc04
DIE TEMPERATURE (°C)
TEMPERATURE ERROR (
REMOTE-DIODE TEMPERATURE ERROR
vs. POWER-SUPPLY NOISE FREQUENCY
MAX6622 toc05
FREQUENCY (MHz)
TEMPERATURE ERROR (
100mVP-P
LOCAL TEMPERATURE ERROR
vs. POWER-SUPPLY NOISE FREQUENCY
MAX6622 toc06
FREQUENCY (MHz)
TEMPERATURE ERROR (
100mVP-P
REMOTE TEMPERATURE ERROR
vs. COMMON-MODE NOISE FREQUENCY
MAX6622 toc07
FREQUENCY (MHz)
TEMPERATURE ERROR (
°C)0.10.01
100mVP-P
MAX6622
5-Channel Precision Temperature Monitor
REMOTE TEMPERATURE ERROR
vs. COMMON-MODE NOISE FREQUENCY
MAX6622 toc08
FREQUENCY (MHz)
TEMPERATURE ERROR (0.10.01
100mVP-P
Typical Operating Characteristics (continued)
(VCC= 3.3V, VSTBY= VCC, TA= +25°C, unless otherwise noted.)
TEMPERATURE ERROR
vs. DXP-DXN CAPACITANCE
MAX6622 toc09
DXP-DXN CAPACITANCE (nF)
TEMPERATURE ERROR (
Pin Description
PINNAMEFUNCTIONDXP1
Combined Current Source and A/D Positive Input for Channel 1 Remote Diode. Connect to the anode
of a remote-diode-connected temperature-sensing transistor. Leave unconnected or connect to VCC if
no remote diode is used. Place a 2200pF capacitor between DXP1 and DXN1 for noise filtering.DXN1Cathode Input for Channel 1 Remote Diode. Connect the cathode of the channel 1 remote-diode-
connected transistor to DXN1. Internally connected to GND.DXP2
Combined Current Source and A/D Positive Input for Channel 2 Remote Diode. Connect to the anode
of a remote-diode-connected temperature-sensing transistor. Leave unconnected or connect to VCC if
no remote diode is used. Place a 2200pF capacitor between DXP2 and DXN2 for noise filtering.DXN2Cathode Input for Channel 2 Remote Diode. Connect the cathode of the channel 2 remote-diode-
connected transistor to DXN2.DXP3
Combined Current Source and A/D Positive Input for Channel 3 Remote Diode. Connect to the anode
of a remote-diode-connected temperature-sensing transistor. Leave unconnected or connect to VCC if
no remote diode is used. Place a 2200pF capacitor between DXP3 and DXN3 for noise filtering.DXN3Cathode Input for Channel 3 Remote Diode. Connect the cathode of the channel 3 remote-diode-
connected transistor to DXN3.
MAX6622
Detailed Description
The MAX6622 is a precision multichannel temperature
monitor that features one local and four remote temper-
ature-sensing channels with a programmable alert
threshold for each temperature channel and a program-
mable overtemperature threshold for channels 1 and 4
(see Figure 1). Communication with the MAX6622 is
achieved through the SMBus serial interface and a
dedicated alert output. The alarm outputs, OVERTand
ALERT, assert if the software-programmed temperature
thresholds are exceeded. ALERTtypically serves as an
interrupt, while OVERTcan be connected to a fan, sys-
tem shutdown, or other thermal-management circuitry.
ADC Conversion Sequence
In the default conversion mode, the MAX6622 starts the
conversion sequence by measuring the temperature on
channel 1, followed by 2, 3, local channel, and 4. The
conversion result for each active channel is stored in
the corresponding temperature data register.
In some systems, one of the remote thermal diodes may
be monitoring a location that experiences temperature
changes that occur much more rapidly than in the other
channels. If faster temperature changes must be moni-
tored in one of the temperature channels, the MAX6622
allows channel 1 to be monitored at a faster rate than
the other channels. In this mode (set by writing a 1 to
bit 4 of the configuration 1 register), measurements of
channel 1 alternate with measurements of the other
channels. The sequence becomes channel 1, channel
2, channel 1, channel 3, channel 1, etc. Note that the
time required to measure all five channels is consider-
ably greater in this mode than in the default mode.
Low-Power Standby Mode
Enter software standby mode by setting the STOP bit to
1 in the configuration 1 register. Enter hardware standby
by pulling STBYlow.Software standby mode disables
the ADC and reduces the supply current to approximate-
ly 30µA. Hardware standby mode halts the ADC clock,
but the supply current is approximately 350µA. During
either software or hardware standby, data is retained in
memory, and the SMBus interface is active and listening
for SMBus commands. The timeout is enabled if a
START condition is recognized on SMBus. Activity on the
SMBus causes the supply current to increase. If a stand-
by command is received while a conversion is in
progress, the conversion cycle is interrupted, and the
temperature registers are not updated. The previous
data is not changed and remains available.
5-Channel Precision Temperature Monitor
PINNAMEFUNCTIONDXP4
Combined Current Source and A/D Positive Input for Channel 4 Remote Diode. Connect to the anode
of a remote-diode-connected temperature-sensing transistor. Leave unconnected or connect to VCC if
no remote diode is used. Place a 2200pF capacitor between DXP4 and DXN4 for noise filtering.DXN4Cathode Input for Channel 4 Remote Diode. Connect the cathode of the channel 4 remote-diode-
connected transistor to DXN4.STBYStandby Input. Drive STBY logic-low to place the MAX6622 in hardware standby mode, or logic-high
for normal operation. Temperature and threshold data are retained in standby mode.N.C.No Connection. Must be connected to ground.OVERTOvertemperature Active-Low, Open-Drain Output. OVERT asserts low when the temperature of
channels 1 and 4 exceed the programmed threshold limit.VCCSupply Voltage Input. Bypass to GND with a 0.1µF capacitor.ALERTSMBus Alert (Interrupt), Active-Low, Open-Drain Output. ALERT asserts low when the temperature of
any channel exceeds the programmed ALERT threshold.SMBDATASMBus Serial-Data Input/Output. Connect to a pullup resistor.SMBCLKSMBus Serial-Clock Input. Connect to a pullup resistor.GNDGround
Pin Description (continued)
SMBus Digital Interface
From a software perspective, the MAX6622 appears as
a series of 8-bit registers that contain temperature mea-
surement data, alarm threshold values, and control bits.
A standard SMBus-compatible, 2-wire serial interface is
used to read temperature data and write control bits
and alarm threshold data. The same SMBus slave
address also provides access to all functions.
The MAX6622 employs four standard SMBus protocols:
write byte, read byte, send byte, and receive byte
(Figure 2). The shorter receive byte protocol allows
quicker transfers, provided that the correct data regis-
ter was previously selected by a read byte instruction.
Use caution with the shorter protocols in multimaster
systems, since a second master could overwrite the
command byte without informing the first master. Figure
3 is the SMBus write timing diagram and Figure 4 is the
SMBus read timing diagram.
The remote diode 1 measurement channel provides 11
bits of data (1 LSB = +0.125°C). All other temperature-
measurement channels provide 8 bits of temperature
data (1 LSB = +1°C). The 8 most significantbits (MSBs)
can be read from the local temperature and remote
temperature registers. The remaining 3 bits for remote
diode 1 can be read from the extended temperature
register. If extended resolution is desired, the extended
resolution register should be read first. This prevents
the most significant bits from being overwritten by new
MAX6622
5-Channel Precision Temperature Monitor
Figure 1. Internal Block Diagram
DXP1
DXN1
DXP2
DXN2
DXP3
DXN3
DXP4
DXN4
INPUT
BUFFER
10/100μA
VCC
REF
COUNT
COUNTER
COMMAND BYTE
REMOTE TEMPERATURES
LOCAL TEMPERATURES
REGISTER BANK
ALERT THRESHOLD
OVERT THRESHOLD
ALERT RESPONSE ADDRESS
ALARM
ALU
ADC
SMBus
INTERFACE
MAX6622
SMBCLKSMBDATA
OVERT
AVERT
STBY
MAX6622
conversion results until they have been read. If the most
significant bits have not been read within an SMBus
timeout period (nominally 37ms), normal updating con-
tinues. Table 1 shows the main temperature register
(high byte) data format, and Table 2 shows the extend-
ed resolution register (low byte) data format.
Diode Fault Detection
If a channel’s input DXP_ and DXN_ are left open, the
MAX6622 detects a diode fault. An open diode fault
does not cause either ALERTor OVERTto assert. A bit in
the status register for the corresponding channel is set to
1 and the temperature data for the channel is stored as
all 1s (FFh). It takes approximately 4ms for the MAX6622
to detect a diode fault. Once a diode fault is detected,
the MAX6622 goes to the next channel in the conversion
sequence. Depending on operating conditions, a short-
ed diode may or may not cause ALERTor OVERTto
assert, so if a channel will not be used, its DXN and DXP
inputs should be left unconnected.
5-Channel Precision Temperature Monitor
Write Byte Format
Read Byte Format
Send Byte FormatReceive Byte Format
SLAVE ADDRESS: EQUIVALENT
TO CHIP-SELECT LINE OF A
3-WIRE INTERFACE
COMMAND BYTE: SELECTS TO
WHICH REGISTER YOU ARE
WRITING
DATA BYTE: DATA GOES INTO THE REGISTER
SET BY THE COMMAND BYTE (TO SET
THRESHOLDS, CONFIGURATION MASKS, AND
SAMPLING RATE)
SLAVE ADDRESS: EQUIVALENT
TO CHIP-SELECT LINE
COMMAND BYTE: SELECTS
FROM WHICH REGISTER YOU
ARE READING
SLAVE ADDRESS: REPEATED
DUE TO CHANGE IN DATA-
FLOW DIRECTION
DATA BYTE: READS FROM
THE REGISTER SET BY THE
COMMAND BYTE
COMMAND BYTE: SENDS COM-
MAND WITH NO DATA, USUALLY
USED FOR ONE-SHOT COMMAND
DATA BYTE: READS DATA FROM
THE REGISTER COMMANDED BY
THE LAST READ BYTE OR WRITE
BYTE TRANSMISSION; ALSO
USED FOR SMBusALERT
RESPONSE RETURN ADDRESS
S = START CONDITION.SHADED = SLAVE TRANSMISSION.
P = STOP CONDITION./// = NOT ACKNOWLEDGED.ADDRESSRDACKDATA///P
7 bits8 bitsSACKCOMMANDACKP
8 bits
ADDRESS
7 bits
ACKDATA
8 bits
ACKCOMMAND
8 bits
ACKWRADDRESS
7 bitsADDRESSWRACKCOMMANDACKSADDRESS
7 bits8 bits7 bitsACKDATA
8 bits
///P
Figure 2. SMBus Protocols
TEMP (°C)DIGITAL OUTPUT
> +1270111 1111
+1270111 1111
+1260111 1110
+250001 10010000 0000
< 00000 0000
Diode fault (open)1111 1111
Diode fault (short)1111 1111 or 1110 1110
Table 1. Main Temperature Register
(High-Byte) Data Format
TEMP (°C)DIGITAL OUTPUT000X XXXX
+0.125001X XXXX
+0.250010X XXXX
+0.375011X XXXX
+0.500100X XXXX
+0.625101X XXXX
+0.725110X XXXX
+0.875111X XXXX
Table 2. Extended Resolution Temperature
Register (Low-Byte) Data Format
Alarm Threshold Registers
There are seven alarm threshold registers that store
overtemperature ALERTand OVERTthreshold values.
Five of these registers are dedicated to store one local
alert temperature threshold limit and four remote alert
temperature threshold limits (see the ALERTInterrupt
Modesection). The remaining two registers are dedi-
cated to remote channels 1 and 4 to store overtempera-
ture threshold limits (see theOVERTOvertemperature
Alarmssection). Access to these registers is provided
through the SMBusinterface.
ALERTInterrupt Mode
An ALERTinterrupt occurs when the internal or external
temperature reading exceeds a high-temperature limit
(user programmable). The ALERTinterrupt output signal
can be cleared by reading the status register(s) associ-
ated with the fault(s) or by successfully responding to an
alert response address transmission by the master. In
both cases, the alert is cleared but is reasserted at the
end of the next conversion if the fault condition still
exists. The interrupt does not halt automatic conversions.
The ALERToutput is open drain so that multiple devices
can share a common interrupt line. All ALERTinterrupts
can be masked using the configuration 3 register. The
POR state of these registers is shown in Table 1.
MAX6622
5-Channel Precision Temperature Monitor
SMBCLK
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVECDEFGHIJ
SMBDATA
tSU:STAtHD:STA
tLOWtHIGH
tSU:DATtSU:STOtBUFK
E = SLAVE PULLS SMBDATA LINE LOW
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO SLAVE
H = LSB OF DATA CLOCKED INTO SLAVE
I = MASTER PULLS DATA LINE LOW
J = ACKNOWLEDGE CLOCKED INTO SLAVE
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION
M = NEW START CONDITION
Figure 3. SMBus Write Timing Diagram
SMBCLKCDEFGHIJK
SMBDATA
tSU:STAtHD:STA
tLOWtHIGH
tSU:DATtHD:DATtSU:STOtBUF
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
E = SLAVE PULLS SMBDATA LINE LOW M
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO MASTER
H = LSB OF DATA CLOCKED INTO MASTER
I = MASTER PULLS DATA LINE LOW
J = ACKNOWLEDGE CLOCKED INTO SLAVE
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION
M = NEW START CONDITION
Figure 4. SMBus Read Timing Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX6622UE9A+ \|MAX6622UE9A	MAXIM	N/a	420	avai	5-Channel Precision Temperature Monitor
MAX6622UE9A+T \|MAX6622UE9AT	MAXI	N/a	3809	avai	5-Channel Precision Temperature Monitor
MAX6622UE9A+T \|MAX6622UE9AT	MAXIM	N/a	2947	avai	5-Channel Precision Temperature Monitor