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9.6.7 SYS VOUT Control Register
Memory location 0x06h, Reset State: 1010 1010 (BQ25120F3A)
Figure 9-17. SYS VOUT Control Register
7 (MSB) 6 5 4 3 2 1 0 (LSB)
1 0 1 0 1 0 1 0
R/W R/W R/W R/W R/W R/W R/W R/W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 9-18. SYS VOUT Control Register
Bit Field Type Reset Description
B7 (MSB) EN_SYS_OUT R/W 1 0 – Disable SW
1 – Enable SW
(When disabled, output is pulled low)
B6 SYS_SEL1 R/W 0 00 – 1.1 V and 1.2 V selection
01 – 1.3 V through 2.8 V selection
10 – 1.5V through 2.75 V selection
11 – 1.8 V through 3.3 V selection
B5 SYS_SEL0 R/W 1
B4 SYS_VOUT_3 R/W 0 OUT Voltage: 800 mV step if SYS_SEL is 01 or 11
B3 SYS_VOUT_2 R/W 1 OUT Voltage: 400 mV step if SYS_SEL is 01 or 11
B2 SYS_VOUT_1 R/W 0 OUT Voltage: 200 mV step if SYS_SEL is 01 or 11
B1 SYS_VOUT_0 R/W 1 OUT Voltage: 100 mV step if SYS_SEL is 01 or 11
B0 (LSB) 0
SW_VOUT Bits: Use SYS_SEL and SYS_VOUT bits to set the output on SYS. The SYS voltage is calculated using the following equation:
See table below for all VOUT values that can be programmed through SYS_SEL and SYS_VOUT.
If SYS_SEL = 01, then SYS = 1.30 V + SYS_VOUTCODE x 100 mV.
If SYS_SEL = 11, then SYS = 1.80 V + SYS_VOUTCODE x 100 mV.
Table 9-19. SYS_SEL Codes
SYS_SEL SYS_VOUT TYP UNIT
00 0000 1.1 V
00 0001 1.2 V
00 0010 1.25 V
00 0011 1.333 V
00 0100 1.417 V
00 0101 1.5 V
00 0110 1.583 V
00 0111 1.667 V
00 1000 1.75 V
00 1001 1.833 V
00 1010 1.917 V
00 1011 2 V
00 1100 2.083 V
00 1101 2.167 V
00 1110 2.25 V
00 1111 2.333 V
01 0000 1.3 V
01 0001 1.4 V
01 0010 1.5 V
01 0011 1.6 V
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BQ25120F3A
SLUSDI4A – OCTOBER 2018 – REVISED APRIL 2021
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