Datasheet

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MAX6950/MAX6951

No-Op Register

The no-op register is used when the MAX6950/

MAX6951 are connected as the last device on a chain

of cascaded SPI devices. To write the other cascaded

device(s), ensure that while the intended device

receives its specific command, the MAX6950/MAX6951

receive a no-op command.

Display-Test Register

The display-test register switches the drivers between

one of two modes: normal and display test. Display-test

mode turns all LEDs on by overriding, but not altering,

all control and digit registers (including the Shutdown

and the duty cycle is 7/16 (half power). Table 11 lists

the display-test register format.

Serially Interfaced, +2.7V to +5.5V,

5- and 8-Digit LED Display Drivers

8 _______________________________________________________________________________________

Table 3. Register Address Map

COMMAND ADDRESS

D15 D14 D13 D12 D11 D10 D9 D8

HEX

CODE

No-Op 0 0 0 0 0 0 0 0 0x00

Decode Mode 0 0 0 0 0 0 0 1 0x01

Intensity 0 0 0 0 0 0 1 0 0x02

Scan Limit 0 0 0 0 0 0 1 1 0x03

Configuration 0 0 0 0 0 1 0 0 0x04

Factory reserved. Do not write to this.

0 0 0 0 0 1 1 0 0x06

Display Test 0 0 0 0 0 1 1 1 0x07

Digit 0 plane P0 only (plane 1 unchanged) 0 0 1 0 0 0 0 0 0x20

Digit 1 plane P0 only (plane 1 unchanged) 0 0 1 0 0 0 0 1 0x21

Digit 2 plane P0 only (plane 1 unchanged) 0 0 1 0 0 0 1 0 0x22

Digit 3 plane P0 only (plane 1 unchanged) 0 0 1 0 0 0 1 1 0x23

Digit 4 plane P0 only (plane 1 unchanged) 0 0 1 0 0 1 0 0 0x24

Digit 5 plane P0 only (plane 1 unchanged) 0 0 1 0 0 1 0 1 0x25

Digit 6 plane P0 only (plane 1 unchanged) 0 0 1 0 0 1 1 0 0x26

Digit 7 plane P0 only (plane 1 unchanged) 0 0 1 0 0 1 1 1 0x27

Digit 0 plane P1 only (plane 0 unchanged) 0 1 0 0 0 0 0 0 0x40

Digit 1 plane P1 only (plane 0 unchanged) 0 1 0 0 0 0 0 1 0x41

Digit 2 plane P1 only (plane 0 unchanged) 0 1 0 0 0 0 1 0 0x42

Digit 3 plane P1 only (plane 0 unchanged) 0 1 0 0 0 0 1 1 0x43

Digit 4 plane P1 only (plane 0 unchanged) 0 1 0 0 0 1 0 0 0x44

Digit 5 plane P1 only (plane 0 unchanged) 0 1 0 0 0 1 0 1 0x45

Digit 6 plane P1 only (plane 0 unchanged) 0 1 0 0 0 1 1 0 0x46

Digit 7 plane P1 only (plane 0 unchanged) 0 1 0 0 0 1 1 1 0x47

D i g i t 0 p l ane P 0 and p l ane P 1 ( w i th sam e d ata) 0 1 1 0 0 0 0 0 0x60

D i g i t 1 p l ane P 0 and p l ane P 1 ( w i th sam e d ata) 0 1 1 0 0 0 0 1 0x61

D i g i t 2 p l ane P 0 and p l ane P 1 ( w i th sam e d ata) 0 1 1 0 0 0 1 0 0x62

D i g i t 3 p l ane P 0 and p l ane P 1 ( w i th sam e d ata) 0 1 1 0 0 0 1 1 0x63

D i g i t 4 p l ane P 0 and p l ane P 1 ( w i th sam e d ata) 0 1 1 0 0 1 0 0 0x64

D i g i t 5 p l ane P 0 and p l ane P 1 ( w i th sam e d ata) 0 1 1 0 0 1 0 1 0x65

D i g i t 6 p l ane P 0 and p l ane P 1 ( w i th sam e d ata) 0 1 1 0 0 1 1 0 0x66

D i g i t 7 p l ane P 0 and p l ane P 1 ( w i th sam e d ata) 0 1 1 0 0 1 1 1 0x67