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PSoC™ 4 HVPA: Current measurement range with different shunt resistance - KBA236359

PSoC™ 4 HVPA: Current measurement range with different shunt resistance - KBA236359

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Version: *A

The current measurement range (
IRMEAS) with PSoC™ 4 HVPA devices is defined as ±3000 A when the shunt resistance (RSENSE) is 100 μΩ [SID104]. IRMEAS with different RSENSE value is calculated as follows:

There are two cases depending on the Programmble gain value (GPGA). Analog gain (GANA) becomes GANA = GPGA /4.

  1. GPGA ≤ 16

PSoCTM 4 HVPA devices specify RSHx and RSLx differential input voltage range = ±0.3 V [SID114]. Therefore, if you change the resistance value, the following formula must be satisfied:

IRMEAS = 0.3 V / RSENSE

  1. GPGA 32

In this case, the input signal drops below the internal reference voltage of 1.2 V if the following formula is satisfied:

IRMEAS_GPGA = 1.2 / (RSENSE × GANA)

From 1 and 2, Table 1 shows an example of the current measurement range (IRMEAS).

Table 1  Current measurement range

Measurement range

GPGA

RSENSE

25 μΩ

50 μΩ

100 μΩ

200 μΩ

IRMEAS_G4

4

±12000 A

±6000 A

±3000 A

±1500 A

IRMEAS_G8

8

±12000 A

±6000 A

±3000 A

±1500 A

IRMEAS_G16

16

±12000 A

±6000 A

±3000 A

±1500 A

IRMEAS_G32

32

±6000 A

±3000 A

±1500 A

±750 A

IRMEAS_G64

64

±3000 A

±1500 A

±750 A

±375 A

IRMEAS_G128

128

±1500 A

±750 A

±375 A

±187.5 A

IRMEAS_G256

256

±750 A

±375 A

±187.5 A

±93.75 A

IRMEAS_G512

512

±375 A

±187.5 A

±93.75 A

±46.875 A


Note: This KBA applies to the following series of PSoC™ 4 HV family MCUs:

  • PSoC™ 4 HVPA series

 

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