JAJSDP6D February 2016 – March 2018 LM36274
PRODUCTION DATA.
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
BL BOOST FREQUENCY | LED CURRENT RAMP[3] | LED CURRENT RAMP[2] | LED CURRENT RAMP[1] | LED CURRENT RAMP[0] | PWM SAMPLE(1) | PWM HYST[1] | PWM HYST[0] |
R/W-1 | R/W-0 | R/W-0 | R/W-0 | R/W-1 | R/W-1 | R/W-0 | R/W-1 |
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset |
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
7 | BL BOOST FREQUENCY | 1 | Sets the backlight boost switch frequency
0: 500 kHz
|
|
6-3 | LED CURRENT RAMP | R/W | 0001 | Controls backlight LED ramping time. The transient time is a constant time that the backlight takes to transition from an existing programmed code to a new programmed code.
0000: 0 µs 0001: 500 µs 0010: 750 µs 0011: 1 ms 0100: 2 ms 0101: 5 ms 0110: 10 ms 0111: 20 ms 1000: 50 ms 1001: 100 ms 1010: 250 ms 1011: 800 ms 1100: 1 s 1101: 2 s 1110: 4 s 1111: 8 s |
2 | PWM SAMPLE | R/W | 1 | Sets PWM sampling frequency
0: 1 MHz 1: 4 MHz (Default0 Note: register 0x10 bit[0] = 1 enables 24-MHz sample mode |
1-0 | PWM HYST | R/W | 01 | Sets the minimum change in PWM input duty cycle that results in a change of backlight LED brightness level
PWM Sample Frequency = 1 MHz or 4 MHz: 00: 1 bit 01: 2 bits 10: 4 bits 11: 6 bits PWM Sample Frequency = 24 MHz: 00: 0 01: 1 bit 10: 2 bits 11: 3 bits |