MAX6957 MAXIM [Maxim Integrated Products], MAX6957 Datasheet - Page 15

• Manufacturer Part Number: MAX6957
• Description: 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port LED Display Driver and I/O Expander
• Manufacturer: MAXIM [Maxim Integrated Products]

Table 4. Power-Up Configuration
X = unused bits; if read, zero results.
Port Register
Bits 4 to 31
Global
Current
Configuration
Register
Input Mask
Register
Display Test
Port
Configuration
Port
Configuration
Port
Configuration
Port
Configuration
Port
Configuration
Port
Configuration
Port
Configuration
Current054
Current076
Current098
Current0BA
Current0DC
Current0FE
Current110
Current132
Current154
Current176
Current198
Current1BA
Current1DC
Current1FE
FUNCTION
REGISTER
28-Port LED Display Driver and I/O Expander
4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and
P15, P14, P13, P12: GPIO Inputs Without Pullup
P19, P18, P17, P16: GPIO Inputs Without Pullup
P23, P22, P21, P20: GPIO Inputs Without Pullup
P27, P26, P25, P24: GPIO Inputs Without Pullup
P31, P30, P29, P28: GPIO Inputs Without Pullup
P11, P10, P9, P8: GPIO Inputs Without Pullup
______________________________________________________________________________________
P7, P6, P5, P4: GPIO Inputs Without Pullup
Transition Detection Disabled
LED Off; GPIO Output Low
POWER-UP CONDITION
Current Control = Global
All Clear (Masked Off)
Shutdown Enabled
1/16 (minimum on)
1/16 (minimum on)
1/16 (minimum on)
1/16 (minimum on)
1/16 (minimum on)
1/16 (minimum on)
1/16 (minimum on)
1/16 (minimum on)
1/16 (minimum on)
1/16 (minimum on)
1/16 (minimum on)
1/16 (minimum on)
1/16 (minimum on)
1/16 (minimum on)
1/16 (minimum on)
Normal Operation
ADDRESS
0x24 to
CODE
(HEX)
0x0C
0x0D
0x1C
0x1D
0x3F
0x02
0x04
0x06
0x07
0x09
0x0A
0x0B
0x0E
0x0F
0x12
0x13
0x14
0x15
0x16
0x17
0x18
0x19
0x1A
0x1B
0x1E
0x1F
D7
X
X
0
X
X
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D6
X
X
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D5
X
X
X
X
0
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
REGISTER DATA
D4
X
X
X
0
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D3
X
X
X
0
0
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D2
X
X
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D1
X
0
X
0
X
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
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