Datasheet

Data Sheet AD5755-1
Rev. E | Page 39 of 52
Status Register
The status register is a read only register. This register contains
any fault information as a well as a ramp active bit and a user
toggle bit. When the STATREAD bit in the main control
register is set, the status register contents can be read back on
the SDO pin during every write sequence. Alternatively, if the
STATREAD bit is not set, the status register can be read using
the normal readback operation.
Table 29. Decoding the Status Register
MSB
LSB
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
DC-
DCD
DC-
DCC
DC-
DCB
DC-
DCA
User
toggle
PEC
error
Ramp
active
Over
TEMP
V
OUT_D
fault
V
OUT_C
fault
V
OUT_B
fault
V
OUT_A
fault
I
OUT_D
fault
I
OUT_C
fault
I
OUT_B
fault
I
OUT_A
fault
Table 30. Status Register Options
Bit Description
DC-DCD In current output mode, this bit is set on Channel D if the dc-to-dc converter cannot maintain compliance (it may be
reaching its V
MAX
voltage). In this case, the I
OUT_D
fault bit is also set. See the DC-to-DC Converter V
MAX
Functionality section
for more information on this bit’s operation under this condition.
In voltage output mode, this bit is set if, on Channel D, the dc-to-dc converter is unable to regulate to 15 V as expected.
When this bit is set, it does not result in the
FAULT
pin going high.
DC-DCC In current output mode, this bit is set on Channel C if the dc-to-dc converter cannot maintain compliance (it may be
reaching its V
MAX
voltage). In this case, the I
OUT_C
fault bit is also set. See the DC-to-DC Converter V
MAX
Functionality section for
more information on this bit’s operation under this condition.
In voltage output mode, this bit is set if, on Channel C, the dc-to-dc converter is unable to regulate to 15 V as expected.
When this bit is set, it does not result in the
FAULT
pin going high.
DC-DCB In current output mode, this bit is set on Channel B if the dc-to-dc converter cannot maintain compliance (it may be
reaching its V
MAX
voltage). In this case, the I
OUT_B
fault bit is also set. See the DC-to-DC Converter V
MAX
Functionality section for
more information on this bit’s operation under this condition.
In voltage output mode, this bit is set if, on Channel B, the dc-to-dc converter is unable to regulate to 15 V as expected.
When this bit is set, it does not result in the
FAULT
pin going high.
DC-DCA In current output mode, this bit is set on Channel A if the dc-to-dc converter cannot maintain compliance (it may be
reaching its V
MAX
voltage). In this case, the I
OUT_A
fault bit is also set. See the DC-to-DC Converter V
MAX
Functionality section for
more information on this bit’s operation under this condition.
In voltage output mode, this bit is set if, on Channel A, the dc-to-dc converter is unable to regulate to 15 V as expected.
When this bit is set, it does not result in the
FAULT
pin going high.
User Toggle User toggle bit. This bit is set or cleared via the software register. This can be used to verify data communications if needed.
PEC Error Denotes a PEC error on the last data-word received over the SPI interface.
Ramp Active This bit is set while any one of the output channels is slewing (slew rate control is enabled on at least one channel).
Over TEMP This bit is set if the AD5755-1 core temperature exceeds approximately 150°C.
V
OUT_D
Fault This bit is set if a fault is detected on the V
OUT_D
pin.
V
OUT_C
Fault This bit is set if a fault is detected on the V
OUT_C
pin.
V
OUT_B
Fault This bit is set if a fault is detected on the V
OUT_B
pin.
V
OUT_A
Fault This bit is set if a fault is detected on the V
OUT_A
pin.
I
OUT_D
Fault
This bit is set if a fault is detected on the I
OUT_D
pin.
I
OUT_C
Fault
This bit is set if a fault is detected on the I
OUT_C
pin.
I
OUT_B
Fault This bit is set if a fault is detected on the I
OUT_B
pin.
I
OUT_A
Fault This bit is set if a fault is detected on the I
OUT_A
pin.