User Manual
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V 1.0
2021-08-25
XDPP1100 technical reference manual
Digital power controller
Current sense (IS)
Peripheral Field name
Access Address
Bits
Description
isen
isp_err_ratio_sel
RW
7000_2414h
(ISEN)
7000_2814h
(BISEN)
[3:1]
Current sense tracking fault error
ratio select.
0: 4 (11.1 percent threshold)
1: 8 (20.0 percent threshold)
2: 12 (27.3 percent threshold)
3: 16 (33.3 percent threshold)
4: 24 (42.9 percent threshold)
5: 32 (50.0 percent threshold)
6: 48 (60.0 percent threshold)
7: 64 (66.7 percent threshold)
isen
isp_apc
RW
7000_2418h
(ISEN)
7000_2818h
(BISEN)
[10:0]
IADC APC, maps the current sense
ADC LSB into amps.
Computed by FW from PMBus
command as follows:
isp_apc = MFR_IOUT_APC
LSB = 1.9531 mA, range = 0.0 to
3.998 A
isen
isp_ioffset
RW
7000_2418h
(ISEN)
7000_2818h
(BISEN)
[7:0]
Phase current offset
Computed by FW from PMBus
command as follows:
isp_offset = IOUT_CAL_OFFSET
LSB = 0.125 A, range = -16 to +15.875
A
3.5
Current sense PMBus commands
The relevant PMBus-related commands for current sensing are given in
Table 17
Current sense-related PMBus commands
Command name
Access Length Address Bits
Description
IOUT_CAL_OFFSET
RW
Word
39h
[15:0]
The IOUT_CAL_OFFSET is used to null out
any offsets in the output current sensing
circuit. This command is most often used
in conjunction with the IOUT_CAL_GAIN
command (above) to minimize the error
of the current sensing circuit.
Linear11 format with suggested
exponent -3.
Unit = amps
FW_CONFIG_REGULATION
RW
Block
14
bytes
C5h
[1]
EN_PRIM_ISENSE:
0 = Only ISEN enabled in single-loop
design
1 = Both ISEN and BISEN enabled in
single-loop design
