DS4432U+ ,Dual-Channel, I²C Adjustable Sink/Source Current DACApplications ♦ I C-Compatible Serial Interface♦ Low CostPower-Supply AdjustmentPower-Supply Margini ..
DS4510U-10 ,CPU Supervisor with Nonvolatile Memory and Programmable I/OApplicationsOrdering InformationRAM-Based FPGA Bank Switching for V TRIP PIN-CC PART TEMP RANGEMult ..
DS4510U-10+ ,CPU Supervisor with Nonvolatile Memory and Programmable I/OApplicationsOrdering InformationRAM-Based FPGA Bank Switching for V TRIP PIN-CC PART TEMP RANGEMult ..
DS4510U-15 ,CPU Supervisor with Nonvolatile Memory and Programmable I/OELECTRICAL CHARACTERISTICS(V = 2.7V to 5.5V, T = -40°C to +85°C.)CC APARAMETER SYMBOL CONDITIONS MI ..
DS4510U-15+ ,CPU Supervisor with Nonvolatile Memory and Programmable I/OFeaturesThe DS4510 is a CPU supervisor with integrated 64-♦ Accurate 5%, 10%, or 15% 5V Power-Suppl ..
DS4510U-5 ,CPU Supervisor with Nonvolatile Memory and Programmable I/OFeaturesThe DS4510 is a CPU supervisor with integrated 64-♦ Accurate 5%, 10%, or 15% 5V Power-Suppl ..
EC2-12NU ,COMPACT AND LIGHTWEIGHT, SMALL MOUNTING SIZE, HIGH BREAKDOWN VOLTAGE
EC2-24 ,COMPACT AND LIGHTWEIGHT, SMALL MOUNTING SIZE, HIGH BREAKDOWN VOLTAGE
EC2-24NU ,COMPACT AND LIGHTWEIGHT, SMALL MOUNTING SIZE, HIGH BREAKDOWN VOLTAGE
EC2-4.5NJ ,COMPACT AND LIGHTWEIGHT, SMALL MOUNTING SIZE, HIGH BREAKDOWN VOLTAGE
EC2-4.5NU ,COMPACT AND LIGHTWEIGHT, SMALL MOUNTING SIZE, HIGH BREAKDOWN VOLTAGE
EC2-4.5TNU ,COMPACT AND LIGHTWEIGHT, SMALL MOUNTING SIZE, HIGH BREAKDOWN VOLTAGE
DS4432U+
Dual-Channel, I²C Adjustable Sink/Source Current DAC
DS4432
Dual-Channel, I2C, 7-Bit Sink/Source
Current DACRev 0; 12/08
General DescriptionThe DS4432 contains two I2C programmable current
DACs that are each capable of sinking and sourcing
current up to 200µA. Each DAC output has 127 sink
and 127 source settings that are programmed using the
I2C interface. The current DAC outputs power up in a
high-impedance state.
ApplicationsPower-Supply Adjustment
Power-Supply Margining
Adjustable Current Sink or Source
FeaturesTwo Current DACsFull-Scale Current 50µA to 200µAFull-Scale Range for Each DAC Determined by
External Resistors127 Settings Each for Sink and Source ModesI2C-Compatible Serial InterfaceLow CostSmall Package (8-Pin µSOP)-40°C to +85°C Temperature Range2.7V to 5.5V Operating RangeDC-DC
CONVERTER
OUT
SDA
SCL
OUT0
OUT1
GND
RFS0RFS1
4.7kΩ4.7kΩVCC
VCCVOUT0
FS0FS1
R0B
R0ADC-DC
CONVERTER
OUT
VOUT1
R1B
R1A
DS4432
Typical Operating Circuit
Ordering Information+Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
PART TEMP RANGE PIN-PACKAGE DS4432U+ -40°C to +85°C 8 μSOP
DS4432U+T&R -40°C to +85°C 8 μSOP
TOP VIEW
DS4432
μSOP7OUT1SCLVCCSDA
OUT0FS136
FS0GND45
Pin Configuration
DS4432
Dual-Channel, I2C, 7-Bit Sink/Source
Current DAC
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS(TA= -40°C to +85°C.)
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.
Voltage Range on VCC, SDA, and SCL
Relative to Ground.............................................-0.5V to +6.0V
Voltage Range on FS0, FS1, OUT0, OUT1
Relative to Ground..................................-0.5V to (VCC+ 0.5V)
(Not to exceed 6.0V.)
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-55°C to +125°C
Soldering Temperature...............................Refer to the IPC/JEDEC
J-STD-020 Specification.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage VCC (Note 1) 2.7 5.5 V
Input Logic 1 (SDA, SCL) VIH 0.7 x VCC VCC + 0.3 V
Input Logic 0 (SDA, SCL) VIL -0.3 0.3 x VCC V
Full-Scale Resistor Values RFS0, RFS1 (Note 2) 40 160 k
DC ELECTRICAL CHARACTERISTICS(VCC= +2.7V to +5.5V, TA= -40°C to +85°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Current ICC VCC = 5.5V (Note 3) 150 μA
Input Leakage (SDA, SCL) IIL VCC = 5.5V 1 μA
Output Leakage (SDA) IL 1 μA
VOL = 0.4V 3 Output Current Low (SDA) IOLVOL = 0.6V 6 mA
RFS Voltage VRFS 0.997 V
I/O Capacitance CI/O 10 pF
OUTPUT CURRENT SOURCE CHARACTERISTICS(VCC= +2.7V to +5.5V, TA= -40°C to +85°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Voltage for Sinking Current VOUT:SINK (Note 4) 0.5 3.5 V
Output Voltage for Sourcing
Current VOUT:SOURCE (Note 4) 0 VCC -
0.75 V
Full-Scale Sink Output Current IOUT:SINK (Notes 1, 4) 50 200 μA
Full-Scale Source Output Current IOUT:SOURCE (Notes 1, 4) -200 -50 μA
Output Current Full-Scale
Accuracy IOUT:FS+25°C, VCC = 3.3V; using 0.1% RFS
resistor, VOUT0 = VOUT1 = 1.2V (Note 2) ±5 %
Output Current Temperature
Coefficient IOUT:TC (Note 5) ±130 ppm/°C
DS4432
Dual-Channel, I2C, 7-Bit Sink/Source
Current DAC
Note 1:All voltages with respect to ground. Currents entering the IC are specified positive, and currents exiting the IC are negative.
Note 2:Input resistors (RFS) must be between the specified values to ensure the device meets its accuracy and linearity specifications.
Note 3:Supply current specified with all outputs set to zero current setting. SDA and SCL are connected to VCC. Excludes current
through RFS resistors (IRFS). Total current including IRFSis ICC+ (2 x IRFS).
Note 4:The output voltage range must be satisfied to ensure the device meets its accuracy and linearity specifications.
Note 5:Temperature drift excludes drift caused by external resistor.
Note 6:Differential linearity is defined as the difference between the expected incremental current increase with respect to position
and the actual increase. The expected incremental increase is the full-scale range divided by 127.
Note 7:Guaranteed by design.
Note 8:Integral linearity is defined as the difference between the expected value as a function of the setting and the actual value.
The expected value is a straight line between the zero and the full-scale values proportional to the setting.
Note 9:Timing shown is for fast-mode (400kHz) operation. This device is also backward compatible with I2C standard-mode timing.
Note 10:CB—total capacitance of one bus line in pF.
OUTPUT CURRENT SOURCE CHARACTERISTICS (continued)(VCC= +2.7V to +5.5V, TA= -40°C to +85°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC source, VOUT measured at 1.2V 0.41 Output Current Variation Due to
Power-Supply Change DC sink, VOUT measured at 1.2V 0.41 %/V
DC source, VCC = 3.3V 0.08 Output Current Variation Due to
Output-Voltage Change DC sink, VCC = 3.3V 0.14 %/V
Output Leakage Current at Zero
Current Setting IZERO -1 +1 μA
Output Current Differential
Linearity DNL (Notes 6, 7) -0.5 +0.5 LSB
Output Current Integral Linearity INL (Notes 7, 8) -1 +1 LSB
AC ELECTRICAL CHARACTERISTICS(VCC= +2.7V to +5.5V, TA= -40°C to +85°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SCL Clock Frequency fSCL (Note 9) 0 400 kHz
Bus Free Time Between STOP
and START Conditions tBUF 1.3 μs
Hold Time (Repeated) START
Condition tHD:STA 0.6 μs
Low Period of SCL tLOW 1.3 μs
High Period of SCL tHIGH 0.6 μs
Data Hold Time tHD:DAT 0 0.9 μs
Data Setup Time tSU:DAT 100 ns
START Setup Time tSU:STA 0.6 μs
SDA and SCL Rise Time tR (Note 10) 20 + 0.1CB 300 ns
SDA and SCL Fall Time tF (Note 10) 20 + 0.1CB 300 ns
STOP Setup Time tSU:STO 0.6 μs
SDA and SCL Capacitive
Loading CB (Note 10) 400 pF
DS4432
Dual-Channel, I2C, 7-Bit Sink/Source
Current DAC
Pin Description
NAME PIN FUNCTION SDA 1 I2C Serial Data. Input/output for I2C data.
SCL 2 I2C Serial Clock. Input for I2C clock.
FS1 3
FS0 5
Full-Scale Calibration Inputs. A resistor to ground on these pins determines the full-scale current
for each output. FS0 controls OUT0; FS1 controls OUT1.
GND 4 Ground
OUT0 6
OUT1 7
Current Outputs. Sinks or sources the current determined by the register settings and the
resistance connected to FS0 and FS1.
VCC 8 Power Supply
Typical Operating Characteristics(Applies to OUT0 and OUT1. VCC= 2.7V to 5.0V, SDA = SCL = VCC, TA= +25°C, and no loads on OUT0, OUT1, FS0, or FS1, unless
otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGEDS4432 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
DOES NOT INCLUDE CURRENT DRAWN BY
RESISTORS CONNECTED TO FS0 OR FS1.
SUPPLY CURRENT
vs. TEMPERATUREDS4432 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (8040200-20
DOES NOT INCLUDE CURRENT DRAWN BY
RESISTORS CONNECTED TO FS0 OR FS1.
VCC = 5.5V
VCC = 3.3V
VCC = 2.7V
VOLTCO (SOURCE)DS4432 toc03
VOUT (V)
IOUT321
40kΩ LOAD ON FS0 AND FS1.
VOLTCO (SINK)DS4432 toc04
VOUT (V)
IOUT
40kΩ LOAD ON FS0 AND FS1.
TEMPERATURE COEFFICIENT
vs. SETTING (SOURCE)DS4432 toc05
SETTING (DEC)
TEMPERATURE COEFFICIENT (
C/ppm)
RANGE FOR THE 50μA TO 200μA CURRENT
SOURCE RANGE.
+25°C TO -40°C
+25°C TO +85°C
TEMPERATURE COEFFICIENT
vs. SETTING (SINK)DS4432 toc06
SETTING (DEC)
TEMPERATURE COEFFICIENT (
C/ppm)
RANGE FOR THE 50μA TO 200μA CURRENT
SINK RANGE.
+25°C TO -40°C
+25°C TO +85°C
DS4432
Dual-Channel, I2C, 7-Bit Sink/Source
Current DAC
Block DiagramVCC
VCC
RFS0RFS1
SDASCL
GND
FS0FS1
OUT1OUT0
CURRENT
DAC0
F8h F9h
SOURCE OR
SINK MODE127 POSITIONS
EACH FOR SINK
AND SOURCE
MODE
CURRENT
DAC1
I2C-COMPATIBLE
SERIAL INTERFACEDS4432
ypical Operating Characteristics (continued)(Applies to OUT0 and OUT1. VCC= 2.7V to 5.0V, SDA = SCL = VCC, TA= +25°C, and no loads on OUT0, OUT1, FS0, or FS1, unless
otherwise noted.)
INTEGRAL LINEARITYDS4432 toc07
SETTING (DEC)
INL (LSB)
RANGE FOR THE 50μA TO 200μA CURRENT
SOURCE AND SINK RANGE.
DIFFERENTIAL LINEARITYDS4432 toc08
SETTING (DEC)
DNL (LSB)
RANGE FOR THE 50μA TO 200μA CURRENT
SOURCE AND SINK RANGE.
DS4432
Dual-Channel, I2C, 7-Bit Sink/Source
Current DAC
Detailed DescriptionThe DS4432 contains two I2C adjustable current DACs
that are each capable of sinking and sourcing current.
Each output (OUT0 and OUT1) has 127 sink and 127
source settings that can be controlled by the I2C inter-
face. The full-scale ranges and corresponding step
sizes of the outputs are determined by external resis-
tors, connected to pins FS0 and FS1.
The formula to determine RFS(connected to the FSx
pins) to attain the desired full-scale current range is:
Equation 1:where IFSis the desired full-scale current value, VRFSis
the RFSvoltage (see the DC Electrical Characteristics
table), and RFSis the external resistor value.
To calculate the output current value (IOUT) based on the
corresponding DAC value (see Table 1 for corresponding
memory addresses), use equation 2.
Equation 2:On power-up the DS4432 outputs zero current. This is
done to prevent the device from sinking or sourcing an
incorrect amount of current before the system host con-
troller has had a chance to modify the DS4432’s setting.
As a source for biasing instrumentation or other circuits,
the DS4432 provides a simple and inexpensive current
DAC with an I2C interface for control. The adjustable
full-scale range allows the application to get the most
out of its 7-bit sink or source resolution.
When used in adjustable power-supply applications
(see the Typical Operating Circuit), the DS4432 does
not affect the initial power-up voltage of the supply
because it defaults to providing zero output current on
power-up. As the device sources or sinks current into
the feedback-voltage node, it changes the amount of
output voltage required by the regulator to reach its
steady-state operating point. Using the external resistor,
RFS, to set the output current range, the DS4432 pro-
vides some flexibility for adjusting the impedances of
the feedback network or the range over which the power
supply can be controlled or margined.
Memory OrganizationTo control the DS4432’s current sources, write to the
memory addresses listed in Table 1.
The format of each output control register is:
where:
Example: RFS0= 80kΩand register 0xF8h is written to
a value of 0xAAh. Calculate the output current.
IFS= (0.997V/80kΩ) x (127/16) = 98.921µA
The MSB of the output register is 1, so the output is sourc-
ing the value corresponding to position 2Ah (42 decimal).
The magnitude of the output current is equal to:
98.921µA x (42/127) = 32.714µA
2C Serial Interface Description
I2C Slave AddressThe DS4432’s slave address is 90h.
I2C DefinitionsThe following terminology is commonly used to describe2C data transfers:
Master Device:The master device controls the slave
devices on the bus. The master device generates
SCL clock pulses and START and STOP conditions.DIOUTFS=×ACValuedec()VIFSRFS××127
Table 1. Memory Addresses
MEMORY ADDRESS
(HEX)CURRENT SOURCE F8h OUT0
F9h OUT1
MSBLSBS D6 D5 D4 D3 D2 D1 D0
BITNAMEFUNCTIONPOWER-ON
DEFAULT Sign
Bit
Determines if DAC sources or
sinks current. For sink
S = 0; for source S = 1.
0b
DX Data
7-Bit Data Controlling DAC
Output. Setting 0000000b
outputs zero current regardless
of the state of the sign bit.
0000000b
