MFS2301BMBACEP datasheet(86/230 Pages) NXP

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NXP Semiconductors

FS23

Safety system basis chip (SBC) with power management, CAN FD and LIN transceivers

19.4.2 VxMON monitoring (x from 1 to 3)

V1 and V3 regulators are monitored via the corresponding V1 and V3 pins, which also serve as feedback pins.

V2 is monitored via its dedicated V2_FB feedback pin. The expected voltage for each regulators, 3.3 V or 5 V, is

configured by OTP (VxMON_OTP), separately from the output voltage and must be configured the same.

Each voltage monitoring channel is connected to a pulldown resistor to detect an undervoltage in case of

disconnection.

The VxMON threshold have ±1.5 % UV/OV accuracy (trimmed at 5 V setting, 5.0 % VxMON threshold).

19.4.3 VxMON UV/OV threshold

The OV and UV thresholds are configured independently for each VxMON (x from 0 to 3) by OTP at

VxMON_UVTH_OTP[3:0] and VxMON_OVTH_OTP[3:0]. UV thresholds are configurable from 96.5 % to 91.5

% and OV thresholds are configurable from 102.5 % to 110 %. When a regulator is configured at 5 V, five

additional UV thresholds are available at 61 %, 62 %, 62.5 %, 63 %, and 64 %.

VxMON_UVTH_OTP[3:0]

VxMON_OVTH_OTP[3:0]

VxMON undervoltage

threshold configuration

VxMON overvoltage

threshold configuration

0000

64 % (for 5 V only)

102.5 %

0001

63 % (for 5 V only)

103.0 %

0010

96.5 %

103.5 %

0011

96.0 %

104.0 %

0100

95.5 %

104.5 %

0101

95.0 %

105.0 %

0110

94.5 %

105.5 %

0111

94.0 %

106.0 %

1000

93.5 %

106.5 %

1001

93.0 %

107.0 %

1010

92.5 %

107.5 %

1011

92.0 %

108.0 %

1100

91.5 %

108.5 %

1101

62.5 % (for 5 V only)

109.0 %

1110

62 % (for 5 V only)

109.5 %

1111

61 % (for 5 V only)

110.0 %

Table 48. VxMON UV/OV threshold configuration

FS23

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Product data sheet

Rev. 7.0 — 16 October 2024

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