Current Sense Amplifier Module (ISENSEV1)
MC9S12VRP Family Reference Manual Rev. 1.3
400
NXP Semiconductors
15.6
Functional Description
15.6.1
General
the current sense amplifier senses the current flowing through the external power FET as a
voltage V
sense
across the resistor R
sense
. In order to measure both positive and negative currents, an
external reference has to be used. The output of the current sense amplifier is connected to an ADC
channel. For more details on ADC channel assignment refer to MCU pin out Section. The input offset
voltage of the current sense amplifier can be adjusted with the OFFS[2:0] bits. The output of the current
sense amplifier is connected to the positive input of the over current comparator. The negative input is
Table 15-7. CSOCT Register Field Descriptions
Field
Description
4:0
OCT[4:0]
Over Current Comparator Threshold
— The over current comparator threshold voltage is the output of a 6-
bit digital-to-analog converter. The upper bit of the digital inputs is tied to one. The other bits of the digital inputs
are driven by OCT. The over current comparator threshold voltage can be calculated from equation
below.These bits cannot be modified after CSWP bit is set.
Voct
32 OCT
+
VDDA
64
------------------
=
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