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ADP1043A
Table 42. Register 0x2E—Modulatio n Limit
Bits
7
Name
Full bridge
R/W
R/W
Description
Enable this bit when operating in full-bridge mode. This mode distributes the modulation equally
between two PWM outputs instead of one. It affects the modulation high limit and the modulation
low limit settings.
[6:4]
Modulation high
limit
R/W
These bits set the maximum allowed modulation that is applied to a PWM output. The value is a
percentage of the switching period.
3
Reserved
Bit 6
0
0
0
0
1
1
1
1
Reserved.
Bit 5
0
0
1
1
0
0
1
1
Bit 4
0
1
0
1
0
1
0
1
Limit (%)
Nominal + 12.5%
Nominal + 25%
Nominal + 31.25%
Nominal + 37.5%
Nominal + 43.75%
Nominal + 46.88%
Nominal + 48.44%
Nominal + 50%
Limit (%) in Full-Bridge Mode
Nominal + 6.25%
Nominal + 12.5%
Nominal + 15.625%
Nominal + 18.75%
Nominal + 21.875%
Nominal + 23.44%
Nominal + 24.22%
Nominal + 25%
2
Pulse skipping
R/W
Setting this bit enables pulse skipping mode. If the ADP1043A requires a duty cycle lower than the
modulation low limit, pulse skipping is enabled.
[1:0]
Modulation low
limit
R/W
These bits set the minimum allowed modulation that is applied to a PWM output. The value is a
percentage of the switching period. If the modulation calculated is lower than this limit, pulse
skipping can be enabled.
Bit 1
0
0
1
1
Bit 0
0
1
0
1
Limit (%)
Nominal ? 50%
Nominal ? 48.44%
Nominal ? 46.88%
Nominal ? 43.75%
Limit (%) in Full-Bridge Mode
Nominal ? 25%
Nominal ? 24.22%
Nominal ? 23.44%
Nominal ? 21.875%
Table 43. Register 0x2F—OTP Threshold
Bits
[7:0]
Name
OTP threshold
R/W
R/W
Description
The OTP threshold value is compared to the RTD ADC reading (Register 0x1A). If the RTD ADC
reading is lower than the threshold set in this register, the OTP flag is set. (The flag is set below the
threshold because using an NTC thermistor causes the reading to decrease as the temperature
increases.) Each LSB typically corresponds to an increased OTP threshold of 3.04 mV. The RTD ADC
range is 0 V to 1.55 V; the OTP threshold is 9.12 mV to 760 mV. There is a hysteresis of 16 mV on the
OTP flag.
Bit 7
0
0
0
…
1
1
Bit 6
0
0
0
…
1
1
…
…
…
…
…
…
…
Bit 3
0
0
0
…
1
1
Bit 2
0
1
1
…
0
0
Bit 1
1
0
0
…
0
1
Bit 0
1
0
1
…
1
0
OTP Limit (mV)
9.12
12.16
15.20
…
756.96
760
Rev. 0 | Page 45 of 72
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