Datasheet

Data Sheet AD5522
Rev. E | Page 55 of 64
READBACK OF PMU REGISTER
The PMU register readback function is a 24-bit word that includes the mode and PMU data bits. Only one PMU register can be read back
at any one time.
Table 32. PMU Register Readback
Bit Bit Name Description
23 (MSB) MODE1 Set the MODE1 and MODE0 bits to 0 to access the selected PMU register.
22 MODE0
PMU Register-Specific Bits
21 CH EN Channel enable. If this bit is high, the selected channel is enabled; if this bit is low, the channel is disabled.
20 FORCE1 These bits indicate which force mode the selected channel is in.
00 = FV and current clamp (if clamp is enabled).
01 = FI and voltage clamp (if clamp is enabled).
10 = high-Z FOHx voltage.
11 = high-Z FOHx current.
19 FORCE0
18 Reserved 0.
17 C2 These three bits indicate which forced or measured current range is set for the selected channel (see
Table 26).
16 C1
15 C0
14 MEAS1 These bits indicate which measure mode is selected: voltage, current, temperature sensor, or high-Z.
00 = MEASOUTx is connected to I
SENSE
.
01 = MEASOUTx is connected to V
SENSE
.
10 = MEASOUTx is connected to the temperature sensor.
11 = MEASOUTx is high-Z (SW12 open).
13 MEAS0
12
FIN
This bit shows the status of the force input (FIN) amplifier.
0 = input of the force amplifier switched to GND.
1 = input of the force amplifier connected to the FIN DAC output.
11
SF0
The system force and sense lines can be connected to any of the four PMU channels. These bits indicate
whether the system force and sense lines are switched in (see Table 26).
10 SS0
9 CL Read back the status of the individual current clamp enable bits.
1 = clamp is enabled on this channel.
0 = clamp is disabled on this channel.
When reading back information about the status of the current clamp enable function, the data that
was most recently written to the current clamp register from either the system control register or the
PMU register is available in the readback word.
8 CPOLH Read back the status of the comparator output enable bit.
1 = PMU comparator output is enabled.
0 = PMU comparator output is disabled.
When reading back information about the status of the comparator output enable function, the data
that was most recently written to the comparator register from either the system control register or the
PMU register is available in the readback word.
7 Compare V/I 1 = compare voltage function is enabled on the selected channel.
0 = compare current function is enabled on the selected channel.
6
LTMPALM TMPALM
corresponds to the open-drain
TMPALM
output pin that flags a temperature event exceeding
the default or user programmed level. The temperature alarm is a per-device alarm; the latched
(
LTMPALM
) and unlatched (
TMPALM
) bits indicate whether a temperature event occurred and whether
the alarm still exists (that is, whether the junction temperature still exceeds the programmed alarm
level). To reset an alarm event, the user must write a 1 to the clear bit (Bit 6) in the PMU register.
5
TMPALM
4 to 0 (LSB) Unused
readback bits
Loads with 0s.