MAX6956AAX 데이터 시트보기 (PDF) - Maxim Integrated

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MAX6956AAX

2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port LED Display Driver and I/O Expander

Maxim Integrated 

2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or

28-Port 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

Port Configuration for P19, P18, P17, P16

Port Configuration for P23, P22, P21, P20

Port Configuration for P27, P26, P25, P24

Port Configuration for P31, P30, P29, P28

ADDRESS

CODE (HEX)

0x09

0x0A

0x0B

0x0C

0x0D

0x0E

0x0F

D7 D6

P7

P11

P15

P19

P23

P27

P31

REGISTER DATA

D5 D4 D3 D2

P6

P5

P10

P9

P14

P13

P18

P17

P22

P21

P26

P25

P30

P29

D1 D0

P4

P8

P12

P16

P20

P24

P28

Table 2. Port Configuration Matrix

MODE

FUNCTION

PORT

REGISTER

(0x20–0x5F)

PIN BEHAVIOR

ADDRESS

CODE (HEX)

PORT

CONFIGURATION

BIT PAIR

UPPER LOWER

Register bit = 0 High impedance

Output LED Segment Driver

Open-drain current sink, with sink

0x09 to 0x0F

0

0

Register bit = 1 current (up to 24mA) determined

by the appropriate current register

Output

GPIO Output

Register bit = 0 Active-low logic output

Register bit = 1 Active-high logic output

0x09 to 0x0F

0

1

Input

GPIO Input

Without Pullup

Schmitt logic input

Register bit =

0x09 to 0x0F

1

0

input logic level

Input GPIO Input with Pullup

Schmitt logic input with pullup

0x09 to 0x0F

1

1

Note: The logic is inverted between the two output modes; a high makes the output go low in LED segment driver mode (0x00) to

turn that segment on; in GPIO output mode (0x01), a high makes the output go high.

simplify access to displays that overlap two MAX6956s,

the MAX6956 provides four virtual ports, P0 through P3.

To update an overlapping digit, send the same code

twice as an eight-port write, once to P28 through P35 of

the first driver, and again to P0 through P7 of the sec-

ond driver. The first driver ignores the last 4 bits and

the second driver ignores the first 4 bits.

Two addressing methods are available. Any single port

(bit) can be written (set/cleared) at once; or, any

sequence of eight ports can be written (set/cleared) in

any combination at once. There are no boundaries; it is

equally acceptable to write P0 through P7, P1 through

P8, or P31 through P38 (P32 through P38 are nonexis-

tent, so the instructions to these bits are ignored).

Using 8-bit control, a seven-segment digit with a deci-

mal point can be updated in a single byte-write, a 14-

segment digit with DP can be updated in two byte-

writes, and 16-segment digits with DP can be updated

in two byte-writes plus a bit write. Also, discrete LEDs

and GPIO port bits can be lit and controlled individually

without affecting other ports.

Shutdown

When the MAX6956 is in shutdown mode, all ports are

forced to inputs (which an be read), and the pullup cur-

rent sources are turned off. Data in the port and control

registers remain unaltered, so port configuration and

output levels are restored when the MAX6956 is taken

out of shutdown. The display driver can still be pro-

grammed while in shutdown mode. For minimum sup-

ply current in shutdown mode, logic inputs should be at

GND or V+ potential. Shutdown mode is exited by set-

ting the S bit in the configuration register (Table 8).

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