MAX6957 MAXIM [Maxim Integrated Products], MAX6957 Datasheet - Page 19

• 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 12. Odd Individual Segment Current Format
Table 14. Display Test Register
X = Don’t care bit.
X = Don’t care bit.
*IRQ is automatically cleared after it is read.
Table 13. Transition Detection Mask Register
FRACTION
FUNCTION
Read Mask
DRIVE
Register
10/16
11/16
12/16
13/16
14/16
15/16
16/16
Display Test Mode
LED
1/16
2/16
3/16
4/16
5/16
6/16
7/16
8/16
9/16
Normal Operation
28-Port LED Display Driver and I/O Expander
MODE
4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and
R
REGISTER
ADDRESS
CURRENT WITH
ISET
______________________________________________________________________________________
(HEX)
CONSTANT
0x06
SEGMENT
= 39kΩ (mA)
10.5
13.5
16.5
19.5
22.5
1.5
4.5
7.5
12
15
18
21
24
3
6
9
ADDRESS CODE
READ/
WRITE
Read
Write
(HEX)
0x07
0x07
CODE (HEX)
0x12 to 0x1F
0x12 to 0x1F
0x12 to 0x1F
0x12 to 0x1F
0x12 to 0x1F
0x12 to 0x1F
0x12 to 0x1F
0x12 to 0x1F
0x12 to 0x1F
0x12 to 0x1F
0x12 to 0x1F
0x12 to 0x1F
0x12 to 0x1F
0x12 to 0x1F
0x12 to 0x1F
0x12 to 0x1F
Unchanged
IRQ Status*
ADDRESS
D7
D7
X
X
mask
Port
D7
D6
30
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
D6
X
X
D6
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
mask
Port
D5
29
D5
X
X
D5
REGISTER DATA
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
REGISTER DATA
mask
Port
D4
D4
28
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
D4
X
X
D3
mask
Port
D3
27
See Table 11.
D3
X
X
D2
mask
D1
Port
D2
26
D2
X
X
D0
mask
Port
D1
D1
25
X
X
HEX CODE
0xAX
0xBX
0xCX
0xDX
0xEX
0x0X
0x1X
0x2X
0x3X
0x4X
0x5X
0x6X
0x7X
0x8X
0x9X
0xFX
mask
Port
D0
D0
24
0
1
19