MP3313 Rev.1.0

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18

8/2/2017

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 SLP_MD1:0 = 00: The short LED fault

detection is disabled.

 SLP_MD1:0 = 01: The short LED fault

detection is enabled, and the FT_SLP is set

when the fault is detected.

 SLP_MD1:0 = 10: The short LED fault

detection is enabled, the FT_SLP is set, and

the string is marked off with the LEDx

voltage that is higher than the threshold.

 SLP_MD1:0 = 11: FT_SLP is set, and the IC

latch off when the fault is detected.

Thermal Shutdown Protection

To prevent the IC from operating at an

exceedingly

high

temperature,

thermal

shutdown is implemented in the MP3313 by

detecting the silicon die temperature. When the

die temperature exceeds the upper threshold

operation when the die temperature drops

below

the

lower

threshold.

Typically,

the

hysteresis value is 25°C. If OTP_SD = 0, the IC

latches off when OTP is triggered.

The 7-bit MSB device address is 0x36 - 0x37

selected by A0. If A0 is floating, it must be pulled

up or down externally to set the address.

master sends a 7-bit address followed by an

eighth read (1) or write (0) bit. The following bit

indicates the register address to or from which

the data is written or read (see Figure 3).

0

A0

1

1

0

1

r/w

1

To avoid a glitch in the operation, the following

bit changes only when the IC EN bit (0x10,

bit[0]) or the three LED channel enable bits

(0x10, bit[3:1]) are set to 0.

The following bit should contain these bits:

1. Mapping mode bit (MAPMOD, 0x11, bit[7])

2. Brightness mode bits (BRTMD2:0, 0x11,

bit[6:4])

3. Slope enable bit (SLPEN, 0x11, bit[3])

4. Slope time bit (TSLP2:0, 0x11, bit[2:0])

5. PWM sample rate bit (PWMSR1:0, 0x12,

bit[7:6])

6. PWM polarity bit (PWM_P, 0x12, bit[5])

7. PWM hysteresis bit (HYS2:0, 0x12, bit [4:2])

8. PWM filter bit (FILTER1:0, 0x12, bit[1:0])

9. Auto

frequency

high

threshold

bit

(FS_AUTOH7:0, 0x15, bit[7:0])

10. Auto

frequency

low

threshold

bit

(FS_AUTOL7:0, 0x16, bit[7:0])