EVAL-ADuM4138EBZ
User Guide
UG-1194
Rev. 0 | Page 5 of 18
REGISTER DESCRIPTIONS
USER TRIM REGISTER
Table 1. Address 00—User Trim Register Map
Field Bits
Description
OFFSET_2[5:0] [23:18]
TS2
offset
GAIN_2[5:0] [17:12]
TS2
gain
OFFSET_1[5:0] [11:6]
TS1
offset
GAIN_1[5:0] [5:0]
TS1
gain
OFFSET_2[5:0]
Internal offset for the Temperature Sense Point 2, TS2, can be
adjusted with the OFFSET_2 field of the EEPROM. There are
6 bits of resolution available.
GAIN_2[5:0]
Internal gain for TS2 can be adjusted with the GAIN_2 field of
the EEPROM. 6 bits of resolution are available.
OFFSET_1[5:0]
Internal offset for TS1 can be adjusted with the OFFSET_1 field
of the EEPROM. There are 6 bits of resolution available.
GAIN_1[5:0]
Internal gain for TS1 can be adjusted with the GAIN_1 field of
the EEPROM. 6 bits of resolution are available.
CONFIGURATION TRIM REGISTER
Table 2. Address 01—Configuration Trim Register Map
Field Bits
Description
Reserved [23:17]
Reserved
OT_Fault_OP
16
Overtemperature fault disable
OT_fault_Sel
15
Overtemperature fault select
OC_TIME_OP 14
Disable two-level drive and timer
during overcurrent event
OC_2Lev_OP 13
Overcurrent two-level operation
select
Low_T_OP
12
Low temperature operation select
OC_Blank_OP
11
Overcurrent blanking operation select
tblank
[10:7]
Overcurrent blanking time
ECC_OFF_OP 6
Enable soft shutdown with error
correcting code (ECC) fault
Flyback_V
[5:2]
Flyback output voltage setting
T_ramp_OP
1
Overcurrent temperature ramp enable
PWM_OSC 0
Temperature reading output oscillator
select
OT_Fault_OP
Set OT_Fault_OP to 1 to disable a fault for over temperature. If
set to 0, the
ADuM4138
issues a fault if the TS1 pin detects an
overtemperature event.
OT_Fault_Sel
OT_Fault_Sel selects between two overtemperature fault voltage
thresholds. Selecting 0 sets the falling threshold to 1.64 V
(typical) and the rising threshold to 1.68 V (typical). Setting the
OT_Fault_SELF bit to 1 sets the falling threshold to 1.68 V
(typical) and the rising threshold to 1.72 V (typical).
OC_TIME_OP
Set OC_TIME_OP to 1 to disable two-level drive and timer
during an overcurrent event. During an overcurrent event, the
output enters soft shutdown immediately. Blanking is still
available.
OC_2Lev_OP
Set OC_2Lev_OP to 1 to disable two-level drive during an
overcurrent event before a fault is registered. After the
overcurrent detection time is complete, a fault is registered, and
the output shuts down using the soft shutdown. If set to 0
during an overcurrent event, but before td_OC, the two-level
drive level is output to the gate.
Low_T_OP
A special low temperature operation can be disabled in Bit 12 of
the configuration trim register. If Low_T_OP is set to 0, when
the sensed IGBT temperature is below −20°C, the gate voltage
rises to the two level plateau voltage during an on command.
Hysteresis allows for operation up to −20°C before the low
temperature operation mode is left. If Low_T_OP is set to 1, all
nonfault gate signals are at the VDD2 output voltage on an on
signal.
OC_Blank_OP
Set OC_Blank_OP to 1 to enable two-level drive during current
blanking time. If OC_Blank_OP is set to 1, two-level drive is
entered in the case of an overcurrent event during the tblank
blanking time.
tblank[3:0]
During the initial turn on of a gate, there can exist a large
amount of noise caused by switching actions. To account for
this, the overcurrent detection can be masked by setting
different tblank values. During the masking time, overcurrent
events are ignored.
