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Circuit Description
The ADC is composed of a 6 bit DAC, comparator,
filter, and 9 bit up/down counter. The 6 MSBs of
the 9 bit counter generate a reference signal to the
comparator. TPH temperature or DTAD back-up
voltage is sensed by comparing DAC output
Battery
Approximate values (TPH Temperature) of R28 and R29 can be calculated
from the following formulas:
Where Tl = minimum temperature, T2 = maximum temperature.
Comparator
Figure 5-5: ADC Block Diagram
I
I
Figure 5-6: THD Connection Circuit
voltage to the comparator with the thermistor
input voltage (THDI), which originates as an
output signal from the TPH. It then supplies the
proper strobe pulse to the TPH. The thermistor
input voltage (THDI) operates within a range of 1
to 4v.
Counter Clock-------i
6 MSBs
I
m
0
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