MAX6957ANI+ Maxim Integrated Products, MAX6957ANI+ Datasheet

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MAX6957ANI+

Manufacturer Part Number
MAX6957ANI+
Description
IC DRIVER LED PORT 20/28 28-DIP
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX6957ANI.pdf (25 pages)

Specifications of MAX6957ANI+

Display Type
LED
Configuration
7, 16, 20 Segment
Interface
4-Wire Serial
Current - Supply
180µA
Voltage - Supply
2.5 V ~ 5.5 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Through Hole
Package / Case
28-DIP (0.300", 7.62mm)
Number Of Segments
28
Low Level Output Current
18000 uA
Operating Supply Voltage
2.5 V to 5.5 V
Maximum Supply Current
270 uA
Maximum Power Dissipation
1143 mW
Maximum Operating Temperature
+ 125 C
Mounting Style
Through Hole
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Digits Or Characters
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
The MAX6957 compact, serial-interfaced LED display
driver general-purpose I/O (GPIO) peripheral provides
microprocessors with up to 28 ports. Each port is indi-
vidually user configurable to either a logic input, logic
output, or common-anode (CA) LED constant-current
segment driver. Each port configured as an LED seg-
ment driver behaves as a digitally controlled constant-
current sink, with 16 equal current steps from 1.5mA to
24mA. The LED drivers are suitable for both discrete
LEDs and CA numeric and alphanumeric LED digits.
Each port configured as a GPIO can be either a push-
pull logic output capable of sinking 10mA and sourcing
4.5mA, or a Schmitt logic input with optional internal
pullup. Seven ports feature configurable transition
detection logic, which generates an interrupt upon
change of port logic level. The MAX6957 is controlled
through an SPI™-compatible 4-wire serial interface.
The MAX6957AAX and MAX6957ATL have 28 ports and
are available in 36-pin SSOP and 40-pin TQFN (6mm x
6mm) packages, respectively. The MAX6957AAI and
MAX6957ANI have 20 ports and are available in 28-pin
SSOP and 28-pin DIP packages, respectively.
For a 2-wire interfaced version, refer to the MAX6956
data sheet.
For a lower cost pin-compatible port expander without
the constant-current LED drive capability, refer to the
MAX7301 data sheet.
19-2429; Rev 4; 2/07
Typical Operating Circuit appears at end of data sheet.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Set-Top Boxes
Panel Meters
White Goods
Automotive
Bar Graph Displays
Industrial Controllers
System Monitoring
28-Port LED Display Driver and I/O Expander
4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and
________________________________________________________________ Maxim Integrated Products
General Description
Applications
♦ High-Speed 26MHz SPI-/QSPI-™/MICROWIRE™-
♦ 2.5V to 5.5V Operation
♦ -40°C to +125°C Temperature Range
♦ 20 or 28 I/O Ports, Each Configurable as
♦ 11µA (max) Shutdown Current
♦ 16-Step Individually Programmable Current
♦ Logic Transition Detection for Seven I/O Ports
Pin Configurations continued at end of data sheet.
MAX6957ANI
MAX6957AAI
MAX6957AAX
MAX6957ATL
Compatible Serial Interface
Control for Each LED
Constant-Current LED Driver
Push-Pull Logic Output
Schmitt Logic Input
Schmitt Logic Input with Internal Pullup
PART
TOP VIEW
DOUT
GND
GND
ISET
P12
P13
P14
P15
P16
P17
P18
P19
P20
P21
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
TEMP RANGE
10
11
12
13
14
1
2
3
4
5
6
7
8
9
Ordering Information
SSOP/DIP
MAX6957
Pin Configurations
PIN-
PACKAGE
28 DIP
28 SSOP
36 SSOP
40 Thin QFN T4066-5
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V+
CS
DIN
SCLK
P31
P30
P29
P28
P27
P26
P25
P24
P23
P22
Features
CODE
N28-2
A28-1
A36-4
PKG
1

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MAX6957ANI+ Summary of contents

Page 1

... Typical Operating Circuit appears at end of data sheet. SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. ♦ High-Speed 26MHz SPI-/QSPI-™/MICROWIRE™- Compatible Serial Interface ♦ ...

Page 2

LED Display Driver and I/O Expander ABSOLUTE MAXIMUM RATINGS Voltage (with Respect to GND) V+ .............................................................................-0.3V to +6V All Other pins................................................-0.3V to (V+ + 0.3V) P4–P31 Current ................................................................±30mA GND Current .....................................................................800mA Continuous Power ...

Page 3

LED Display Driver and I/O Expander ELECTRICAL CHARACTERISTICS (continued) (Typical Operating Circuit 2.5V to 5.5V, T PARAMETER SYMBOL Port Sink Current Output Short-Circuit Current I OLSC Port Drive LED Sink Current, ...

Page 4

LED Display Driver and I/O Expander __________________________________________Typical Operating Characteristics (R = 39kΩ +25°C, unless otherwise noted.) ISET A OPERATING SUPPLY CURRENT vs. TEMPERATURE 0. 2.5V TO 5.5V 0.36 NO ...

Page 5

LED Display Driver and I/O Expander PIN NAME 28 SSOP DIP SSOP TQFN ISET 37, 38 GND DOUT 5–24 ...

Page 6

LED Display Driver and I/O Expander Table 1. Port Configuration Map REGISTER Port Configuration for P7, P6, P5, P4 Port Configuration for P11, P10, P9, P8 Port Configuration for P15, P14, P13, P12 ...

Page 7

LED Display Driver and I/O Expander P4 TO P31 LED DRIVERS LED DRIVERS AND GPIO OR GPIO SEGMENT OR GPIO DATA DIN SCLK Figure 1. ...

Page 8

LED Display Driver and I/O Expander 7-SEGMENT DIGIT 1 VIRTUAL SEGMENTS P10 P11 P12 P13 P14 P15 P16 P17 P18 P19 P20 P21 ...

Page 9

LED Display Driver and I/O Expander MICROCONTROLLER SERIAL DATA INPUT SERIAL CS OUTPUT SERIAL CLOCK OUTPUT SERIAL DATA OUTPUT Figure 4. Daisy-Chain Arrangement for Controlling Multiple MAX6957s CS SCLK D15 DIN D14 D13 ...

Page 10

LED Display Driver and I/O Expander It is acceptable to clock more than 16 bits into the MAX6957 between taking CS low and taking CS high again. In this case, only the last ...

Page 11

LED Display Driver and I/O Expander Table 3. Register Address Map REGISTER No-Op Global Current Configuration Transition Detect Mask Display Test Port Configuration P7, P6, P5, P4 Port Configuration P11, P10, P9, P8 ...

Page 12

LED Display Driver and I/O Expander Table 3. Register Address Map (continued) REGISTER Port 11 only (data bit D0. D7–D1 read as 0) Port 12 only (data bit D0. D7–D1 read as 0) ...

Page 13

LED Display Driver and I/O Expander Table 3. Register Address Map (continued) REGISTER 8 ports 16–23 (data bits D0–D7) 8 ports 17–24 (data bits D0–D7) 8 ports 18–25 (data bits D0–D7) 8 ports ...

Page 14

LED Display Driver and I/O Expander P31 GPIO INPUT CONDITIONING P30 GPIO/PORT OUTPUT LATCH GPIO INPUT CONDITIONING P29 GPIO/PORT OUTPUT LATCH GPIO INPUT CONDITIONING P28 GPIO/PORT OUTPUT LATCH GPIO INPUT CONDITIONING P27 GPIO/PORT ...

Page 15

LED Display Driver and I/O Expander Table 4. Power-Up Configuration REGISTER POWER-UP CONDITION FUNCTION Port Register LED Off; GPIO Output Low Bits Global 1/16 (minimum on) Current Shutdown Enabled Configuration ...

Page 16

LED Display Driver and I/O Expander Table 5. Configuration Register Format ADDRESS CODE FUNCTION (HEX) Configuration Register 0x04 X = Don’t care bit. Table 6. Shutdown Control (S Data Bit D0) Format ADDRESS ...

Page 17

LED Display Driver and I/O Expander Table 9. Global Segment Current Register Format (continued) LED DRIVE TYPICAL SEGMENT FRACTION CURRENT (mA) 6/16 9 7/16 10.5 8/16 12 9/16 13.5 10/16 15 11/16 16.5 ...

Page 18

LED Display Driver and I/O Expander Table 11. Even Individual Segment Current Format SEGMENT LED DRIVE CONSTANT FRACTION CURRENT WITH R = 39kΩ (mA) ISET 1/16 1.5 2/16 3 3/16 4.5 4/16 6 ...

Page 19

LED Display Driver and I/O Expander Low-Voltage Operation The MAX6957 operates down to 2V supply voltage (although the sourcing and sinking currents are not guaranteed), providing that the MAX6957 is powered Table 12. ...

Page 20

LED Display Driver and I/O Expander SPI Routing Considerations The MAX6957’s SPI interface is guaranteed to operate at 26Mbps on a 2.5V supply, and supply typically operates at 50Mbps. This ...

Page 21

LED Display Driver and I/O Expander 3V 36 47nF 39kΩ 34 4-WIRE DATA IN 33 4-WIRE CLOCK IN 35 CHIP SELECT ...

Page 22

LED Display Driver and I/O Expander (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages ...

Page 23

LED Display Driver and I/O Expander (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages TOP VIEW ...

Page 24

LED Display Driver and I/O Expander (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) 24 ______________________________________________________________________________________ Package Information ...

Page 25

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 25 © 2007 Maxim Integrated Products Package Information (continued registered trademark of Maxim Integrated Products, Inc ...

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