INA700 datasheet(36/50 Pages) TI

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An overcurrent threshold is set by programming the Current Over-Limit Threshold register (COL). The value that

must be programmed into this register is calculated by dividing the overcurrent limit value by the current LSB

size. For this example, the target value for the COL register is 9 A ÷ 480 μA = 18750d (493Eh).

An overvoltage fault threshold on the bus voltage is set by programming the bus overvoltage limit register

(BOVL). In this example the desired overvoltage threshold is 14 V. The value that must be programmed into this

For this example, the target value for the BOVL register is 14 V ÷ 3.125 mV = 4480d (1180h).

When setting the power over-limit value, the LSB size used to calculate the value needed in the limit registers

will be 256 times greater than the power LSB. This is because the power register is a 24 bits in length while the

power fault limit register is 16 bits. The LSB value to use for setting the over-power fault limit is 24.576 mW.

Values stored in the alert limit registers are set to the default values after VS power cycle events and must be

reprogrammed each time power is applied.

8.2.2.3 Calculate Returned Values

Parametric values are calculated by multiplying the returned value by the LSB value. Table 8-4 shows the

returned values for this application example, assuming the design requirements shown in Table 8-3.

Table 8-4. Calculating Returned Values

PARAMETER

RETURNED VALUE

LSB VALUE

CALCULATED VALUE

Current (A)

10417d

480 µA

5.00016 A

Bus voltage (V)

3840d

3.125 mV

12 V

Power (W)

625020d

96 µW

60.00192 W

Energy (J)

140629500d

1.536 mJ

216.007 kJ

Charge (C)

3750120d

30 µC

18000.576 C

Temperature (°C)

320d

125 mºC

40°C

Current, Bus Voltage (positive only), Charge, and Temperature return values in 2's-complement format. In

2's-complement format a negative value in binary is represented by having a 1 in the most significant bit of the

returned value. These values can be converted to decimal by first inverting all the bits and adding 1 to obtain the

unsigned binary value. This value can then be converted to decimal with the negative sign applied. For example,

assume a current reading returns 1011 0100 0001 0000. This is a negative value due to the MSB having a

value of one. Inverting the bits and adding one results in 0100 1011 1111 0000 (19440d) which from the current

value example in Table 8-4 correlates to a current of 9.3312 A. The returned value was negative, therefore the

measured current value is –9.3312 A.

INA700

SBOSAB4A – MAY 2023 – REVISED SEPTEMBER 2023

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