MAX7219CNG. ,Serially Interfaced / 8-Digit LED Display DriversFeaturesThe MAX7219/MAX7221 are compact, serial input/out-' 10MHz Serial Interfaceput common-cathod ..
MAX7219CNG+ ,Serially Interfaced, 8-Digit, LED Display DriversFeaturesThe MAX7219/MAX7221 are compact, serial input/out-♦♦ 10MHz Serial Interfaceput common-catho ..
MAX7219CWG ,Serially Interfaced / 8-Digit LED Display DriversGeneral Description ________
MAX7219CWG+ ,Serially Interfaced, 8-Digit, LED Display DriversFeaturesThe MAX7219/MAX7221 are compact, serial input/out-♦♦ 10MHz Serial Interfaceput common-catho ..
MAX7219CWG+T ,Serially Interfaced, 8-Digit, LED Display DriversFeaturesThe MAX7219/MAX7221 are compact, serial input/out-♦♦ 10MHz Serial Interfaceput common-catho ..
MAX7219ENG ,Serially Interfaced / 8-Digit LED Display DriversGeneral Description ________
MB47358 ,DUAL OPERATIONAL AMPLIFIERFUJITSU SEMICONDUCTORDS04-11104-3EDATA SHEETLINEAR ICDUAL OPERATIONAL AMPLIFIERMB47358DUAL OPERATIO ..
MB47393 ,DUAL COMPARATORFUJITSU SEMICONDUCTORDS04-12103-4EDATA SHEETASSPDUAL COMPARATORMB47393n DESCRIPTIONThe Fujitsu MB47 ..
MB47393P ,Dual comparatorFUJITSU SEMICONDUCTORDS04-12103-4EDATA SHEETASSPDUAL COMPARATORMB47393n DESCRIPTIONThe Fujitsu MB47 ..
MB47393P ,Dual comparatorFUJITSU SEMICONDUCTORDS04-12103-4EDATA SHEETASSPDUAL COMPARATORMB47393n DESCRIPTIONThe Fujitsu MB47 ..
MB47393PF ,Dual comparatorFUJITSU SEMICONDUCTORDS04-12103-4EDATA SHEETASSPDUAL COMPARATORMB47393n DESCRIPTIONThe Fujitsu MB47 ..
MB4752A ,SUBSCRIBER LINE INTERFACE IC" mm;
gr T$544-A874
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MAX7219CNG-MAX7219CNG.-MAX7219CWG-MAX7219ENG-MAX7219EWG-MAX7221CNG-MAX7221CWG-MAX7221ENG-MAX7221EWG
Serially Interfaced / 8-Digit LED Display Drivers
_______________General DescriptionThe MAX7219/MAX7221 are compact, serial input/out-
put common-cathode display drivers that interface
microprocessors (µPs) to 7-segment numeric LED dis-
plays of up to 8 digits, bar-graph displays, or 64 indi-
vidual LEDs. Included on-chip are a BCD code-B
decoder, multiplex scan circuitry, segment and digit
drivers, and an 8x8 static RAM that stores each digit.
Only one external resistor is required to set the seg-
ment current for all LEDs. The MAX7221 is compatible
with SPI™, QSPI™, and Microwire™, and has slew-rate-
limited segment drivers to reduce EMI.
A convenient 3-wire serial interface connects to all
common µPs. Individual digits may be addressed and
updated without rewriting the entire display. The
MAX7219/MAX7221 also allow the user to select code-
B decoding or no-decode for each digit.
The devices include a 150µA low-power shutdown
mode, analog and digital brightness control, a scan-
limit register that allows the user to display from 1 to 8
digits, and a test mode that forces all LEDs on.
________________________ApplicationsBar-Graph Displays
7-Segment Displays
Industrial Controllers
Panel Meters
LED Matrix Displays
____________________________Features10MHz Serial InterfaceIndividual LED Segment ControlDecode/No-Decode Digit Selection150µA Low-Power Shutdown (Data Retained)Digital and Analog Brightness ControlDisplay Blanked on Power-UpDrive Common-Cathode LED DisplaySlew-Rate Limited Segment Drivers
for Lower EMI (MAX7221)SPI, QSPI, Microwire Serial Interface (MAX7221)24-Pin DIP and SO Packages
MAX7219/MAX7221
Serially Interfaced, 8-Digit LED Display Drivers
________Typical Application Circuit__________________Pin Configuration19-4452; Rev 3; 7/97
SPI and QSPI are trademarks of Motorola Inc. Microwire is a trademark of National Semiconductor Corp.
MAX7219/MAX7221
Serially Interfaced, 8-Digit LED Display Drivers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(V+ = 5V ±10%, RSET = 9.53kΩ±1%, TA= TMINto TMAX, unless otherwise noted.)
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 (with respect to GND)............................................................................-0.3V to 6V
DIN, CLK, LOAD, CS...............................................-0.3V to 6V
All Other Pins.............................................-0.3V to (V+ + 0.3V)
Current
DIG0–DIG7 Sink Current................................................500mA
SEGA–G, DP Source Current.........................................100mA
Continuous Power Dissipation (TA= +85°C)
Narrow Plastic DIP..........................................................0.87W
Wide SO..........................................................................0.76W
Narrow CERDIP.................................................................1.1W
Operating Temperature Ranges
MAX7219C_G/MAX7221C_G..............................0°C to +70°C
MAX7219E_G/MAX7221E_G............................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX7219/MAX7221
Serially Interfaced, 8-Digit LED Display Drivers
ELECTRICAL CHARACTERISTICS (continued)(V+ = 5V ±10%, RSET =9.53kΩ±1%, TA= TMINto TMAX, unless otherwise noted.)
MAX7219/MAX7221
Serially Interfaced, 8-Digit LED Display Drivers
__________________________________________Typical Operating Characteristics(V+ = +5V, TA = +25°C, unless otherwise noted.)
MAX7219/MAX7221
Serially Interfaced, 8-Digit LED Display Drivers
______________________________________________________________Pin Description
_________________________________________________________Functional Diagram
MAX7219/MAX7221
Serially Interfaced, 8-Digit LED Display Drivers
_______________Detailed Description
MAX7219/MAX7221 DifferencesThe MAX7219 and MAX7221 are identical except for
two parameters: the MAX7221 segment drivers are
slew-rate limited to reduce electromagnetic interfer-
ence (EMI), and its serial interface is fully SPI compati-
ble.
Serial-Addressing ModesFor the MAX7219, serial data at DIN, sent in 16-bit
packets, is shifted into the internal 16-bit shift register
with each rising edge of CLK regardless of the state of
LOAD. For the MAX7221, CSmust be low to clock data
in or out. The data is then latched into either the digit or
control registers on the rising edge of LOAD/CS.
LOAD/CSmust go high concurrently with or after the
16th rising clock edge, but before the next rising clock
edge or data will be lost. Data at DIN is propagated
through the shift register and appears at DOUT 16.5
clock cycles later. Data is clocked out on the falling
edge of CLK. Data bits are labeled D0–D15 (Table 1).
D8–D11 contain the register address. D0–D7 contain
the data, and D12–D15 are “don’t care” bits. The first
received is D15, the most significant bit (MSB).
Digit and Control RegistersTable 2 lists the 14 addressable digit and control regis-
ters. The digit registers are realized with an on-chip,
8x8 dual-port SRAM. They are addressed directly so
that individual digits can be updated and retain data as
long as V+ typically exceeds 2V. The control registers
consist of decode mode, display intensity, scan limit
(number of scanned digits), shutdown, and display test
(all LEDs on).
Shutdown ModeWhen the MAX7219 is in shutdown mode, the scan oscil-
lator is halted, all segment current sources are pulled to
ground, and all digit drivers are pulled to V+, thereby
blanking the display. The MAX7221 is identical, except
the drivers are high-impedance. Data in the digit and
control registers remains unaltered. Shutdown can be
used to save power or as an alarm to flash the display by
successively entering and leaving shutdown mode. For
minimum supply current in shutdown mode, logic inputs
should be at ground or V+ (CMOS-logic levels).
Typically, it takes less than 250µs for the MAX7219/
MAX7221 to leave shutdown mode. The display driver
can be programmed while in shutdown mode, and
shutdown mode can be overridden by the display-test
function.
Figure 1. Timing Diagram
Table 1. Serial-Data Format (16 Bits)
Initial Power-UpOn initial power-up, all control registers are reset, the
display is blanked, and the MAX7219/MAX7221 enter
shutdown mode. Program the display driver prior to
display use. Otherwise, it will initially be set to scan one
digit, it will not decode data in the data registers, and
the intensity register will be set to its minimum value.
Decode-Mode RegisterThe decode-mode register sets BCD code B (0-9, E, H,
L, P, and -) or no-decode operation for each digit. Each
bit in the register corresponds to one digit. A logic high
selects code B decoding while logic low bypasses the
decoder. Examples of the decode mode control-regis-
ter format are shown in Table 4.
When the code B decode mode is used, the decoder
looks only at the lower nibble of the data in the digit
registers (D3–D0), disregarding bits D4–D6. D7, which
sets the decimal point (SEG DP), is independent of the
decoder and is positive logic (D7 = 1 turns the decimal
point on). Table 5 lists the code B font.
When no-decode is selected, data bits D7–D0 corre-
spond to the segment lines of the MAX7219/MAX7221.
Table 6 shows the one-to-one pairing of each data bit
to the appropriate segment line.
MAX7219/MAX7221
Serially Interfaced, 8-Digit LED Display Drivers
Table 3. Shutdown Register Format (Address (Hex) = XC)
Table 4. Decode-Mode Register Examples (Address (Hex) = X9)
MAX7219/MAX7221
Intensity Control
and Interdigit BlankingThe MAX7219/MAX7221 allow display brightness to be
controlled with an external resistor (RSET) connected
between V+ and ISET. The peak current sourced from
the segment drivers is nominally 100 times the current
entering ISET. This resistor can either be fixed or vari-
able to allow brightness adjustment from the front
panel. Its minimum value should be 9.53Ω, which typi-
cally sets the segment current at 40mA. Display bright-
ness can also be controlled digitally by using the
intensity register.
Digital control of display brightness is provided by an
internal pulse-width modulator, which is controlled by
the lower nibble of the intensity register. The modulator
scales the average segment current in 16 steps from a
maximum of 31/32 down to 1/32 of the peak current set
by RSET(15/16 to 1/16 on MAX7221). Table 7 lists the
intensity register format. The minimum interdigit blank-
ing time is set to 1/32 of a cycle.
Serially Interfaced, 8-Digit LED Display Drivers
Table 5. Code B Font*The decimal point is set by bit D7 = 1
