Data Sheet Rev. E August 2021 | Subject to change without notice

31 of 37

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ACT4910

Power Loss Protection with 6A eFuse

®

CMI OPTIONS

This section provides the basic default configuration settings for each available ACT4910 CMI option. Refer to each

option’s application note for the comprehensive list of default settings

CMI 121: ACT4910QW121

CMI 121 is designed for standard 12V applications. CMI 121 default settings are appropriate for most typical applications.

It provides the fastest buck switching frequency for the smallest solution sizes. The table below shows the default register

settings.

CMI 121 Default Register Settings

Function

Value

Register

Register Settings

PLI Pin Function

PLI & VOUT OK

0x19h

PLI_FUNC_SEL[1:0] = 11

Health Monitor Time

32ms

0x1Fh

HMON_TSET[3:0] = 0100

Health Monitor Threshold

96%

0x20h

HMON_THR[3:0] = 0101

Enable Overvoltage Reference

0.92V

0x20h

EN_OV_REF[2:0] = 010

Startup Delay

0ms

0x20h

EN_STARTDELAY = 0

Latch Supplement Mode

Yes

0x21h

EN_LATCH_SPLMNT = 1

Boost Current Limit

950mA

0x21h

BST_CLIM[1:0] = 10

Boost Voltage

28V

0x21h

BST_VSET[4:0] = 10111

Buck Peak Current Limit

9A

0x26h

BK_CLIM[1:0] = 11

Buck Switching Frequency

1130kHz

0x28h

BK_FREQ[2:0] = 111

I2C Address

The CMI 121 7-bit I2C address is 0x5Ah. This results in 0xB4h for a write address and 0xB5h for a read address.

Device ID

The CMI 121 Device ID (register 0x3Bh) = 0x02h. This can be used to distinguish between different CMI versions.

Autonomous ADC Supervisory Function

The autonomous ADC supervisory function is disabled by default. All undervoltage register value are set to 0x00h and

all overvoltage register values are set to 0xFFh.