STP1612PW05QTR STMicroelectronics, STP1612PW05QTR Datasheet - Page 22

• Manufacturer Part Number: STP1612PW05QTR
• Description: 16-channel Led Driver With 16-bit Pwm, 8-bit Gain And Full Led Error Detection
• Manufacturer: STMicroelectronics

Current gain adjustment
12
22/32
Figure 13. Gain vs DA6 - DA0
Current gain adjustment
The bit 9 to bit 2 of the configuration register set the gain of output current, i.e., G. Being 8-
bit in total, ranging from 8’b00000000 to 8’b11111111, these bits allow the user to set the
output current gain up to 256 levels. These bits can be further defined in the configuration
register as follows:
1.
2.
The relationship between these bits and current gain G is:
HC = 1, D = (256G-128)/3
HC = 0, D = (1024G-128)/3
and D in the above decimal numeration can be converted to its equivalent in binary form by
the following equation:
D = DA6x2
In other words, these bits can be looked as a floating number with 1-bit exponent HC and 7-
bit mantissa DA6~DA0.
MSB
F
-
Bit 9 is HC bit. The setting is in the low current range when HC=0, and in the high
current range when HC=1.
Bit 8 to bit 2 are DA6 ~ DA0.
E
-
6
+ DA5x2
D
-
C
-
5
+ DA4x2
B
-
Doc ID 15819 Rev 2
A
-
4
+ DA3x2
HC
9
DA6
3
8
+ DA2x2
DA5
7
2
DA4
+ DA1x2
6
DA3
5
1
Configuration register
+ DA0x2
DA2
4
DA1
3
0
DA0
STP1612PW05
2
1
-
LSB
0
-