L9374LF datasheet(71/80 Pages) STMICROELECTRONICS

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L9374LF

Programmers guide

5.2.6

Reference diode voltage measurement (V_FWD) (address 10)

Reference diode forward voltage (V_FWD):

The V_FWD value is a measurement of an internal reference diode using a fixed reference

current. This corresponds to the forward voltage of one of the current controller output

freewheeling diodes.

The resolution of the LSB is 7.8mV (typ.) and the parameter range is:

Note:

Refer to section : V_FWD for more information.

5.2.7

Sense resistor measurement (Rs) (address 11)

Refer to Section 4.5.2 for more information)

The resolution of the LSB is 8.7m

 (typ.) and the parameter range is:

MSB

LSB

101000

V_FWD

Parit

free

Table 68. Reference diode voltage measurement

Description

Number of bits

Resolution per bit

Reference diode forward voltage drop

9 Bit

7.8 mV typ

Table 69. V_FWD value

SPI - Bit

V_FWD

2 V

1 V

1/2 V

1/4 V

1/8 V

1/16 V

1/32 V

1/64 V 1/128 V

MSB

LSB

101100

Parit

free

Table 70. Sense resistor measurement

Channel status

Number of bits

Name

Sense resistor measurement

9 Bit

Table 71. Rs value

SPI - Bit

Rs-value

4 Ω

2 Ω

1 Ω

1/2 Ω

1/4 Ω

1/8 Ω

1/16 Ω

1/32 Ω

1/64 Ω

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