ACT4910QW
Rev 1.0, 15-Sept-2017
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. Table 10 shows the default register
settings.
Table 10: CMI 121 Default Register Settings
Function
Value
PLI & VOUT OK
32ms
Register
0x19h
Register Settings
PLI_FUNC_SEL[1:0] = 11
HMON_TSET[3:0] = 0100
HMON_THR[3:0] = 0101
EN_OV_REF[2:0] = 010
EN_STARTDELAY = 0
EN_LATCH_SPLMNT = 1
BST_CLIM[1:0] = 10
PLI Pin Function
Health Monitor Time
Health Monitor Threshold
Enable Overvoltage Reference
Startup Delay
0x1Fh
0x20h
0x20h
0x20h
0x21h
0x21h
0x21h
0x26h
0x28h
96%
0.92V
0ms
Latch Supplement Mode
Boost Current Limit
Yes
950mA
28V
Boost Voltage
BST_VSET[4:0] = 10111
BK_CLIM[1:0] = 11
Buck Peak Current Limit
Buck Switching Frequency
9A
1130kHz
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.
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