MAX6957 Datasheet, PDF (15/23 Pages) Maxim Integrated Products – 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port LED Display Driver and I/O Expander

4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and
28-Port LED Display Driver and I/O Expander
Table 4. Power-Up Configuration
REGISTER
FUNCTION
POWER-UP CONDITION
Port Register
Bits 4 to 31
LED Off; GPIO Output Low
Global
Current
1/16 (minimum on)
Configuration
Register
Shutdown Enabled
Current Control = Global
Transition Detection Disabled
Input Mask
Register
Display Test
Port
Configuration
All Clear (Masked Off)
Normal Operation
P7, P6, P5, P4: GPIO Inputs Without Pullup
Port
Configuration
Port
Configuration
P11, P10, P9, P8: GPIO Inputs Without Pullup
P15, P14, P13, P12: GPIO Inputs Without Pullup
Port
Configuration
P19, P18, P17, P16: GPIO Inputs Without Pullup
Port
Configuration
P23, P22, P21, P20: GPIO Inputs Without Pullup
Port
Configuration
P27, P26, P25, P24: GPIO Inputs Without Pullup
Port
Configuration
P31, P30, P29, P28: GPIO Inputs Without Pullup
Current054
1/16 (minimum on)
Current076
1/16 (minimum on)
Current098
1/16 (minimum on)
Current0BA
1/16 (minimum on)
Current0DC
1/16 (minimum on)
Current0FE
1/16 (minimum on)
Current110
1/16 (minimum on)
Current132
1/16 (minimum on)
Current154
1/16 (minimum on)
Current176
1/16 (minimum on)
Current198
1/16 (minimum on)
Current1BA
1/16 (minimum on)
Current1DC
1/16 (minimum on)
Current1FE
1/16 (minimum on)
X = unused bits; if read, zero results.
ADDRESS
CODE
REGISTER DATA
(HEX)
D7 D6 D5 D4 D3 D2 D1 D0
0x24 to
0x3F
XXXXXXX0
0x02
XXXX 0 0 0 0
0x04
00XXXXX0
0x06
0x07
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
0x12
0x13
0x14
0x15
0x16
0x17
0x18
0x19
0x1A
0x1B
0x1C
0x1D
0x1E
0x1F
X0000000
XXXXXXX0
10101010
10101010
10101010
10101010
10101010
10101010
10101010
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
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