MFS2401AVBA0ES datasheet(65/151 Pages) NXP

65 / 151 page

NXP Semiconductors

FS2400

Fail-safe system basis chip with SMPS and LDO, CAN FD transceiver

19.3.1 V0MON (VMON_EXT) monitoring

VMON_EXT input pin can be connected to an external regulator. The regulator connected to VMON_EXT must

be at least 1 V to be compatible with overvoltage and undervoltage monitoring thresholds. An external resistor

bridge must be used to divide the regulator voltage if higher than 1 V. The resistor bridge middle point voltage

must be set to 1 V. The external resistors accuracy must be at least ±1 %, to ensure a total accuracy of ±2.5 %

with the internal thresholds accuracy (±1.5 %).

The MCU can monitor VMON_EXT pin voltage using the AMUX by selecting channel 18, see Section 15.3.

19.3.2 VxMON monitoring (x = 1, 3)

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

pins. The expected voltage for each regulator is automatically selected based on the OTP output voltage

configuration.

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

disconnection.

The VxMON UV/OV threshold have ±1 % accuracy (trimmed at 5 V setting, 5 % VMON threshold).

19.3.3 VxMON UV/OV threshold

The OV and UV thresholds are configured independently for each VxMON (x = 0, 1, 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 62 %, 63.5 %, 64 %, 64.5 %, and 65 %.

VMONx_UVTH_OTP[3:0]

VMONx_OVTH_OTP[3:0]

VMONx undervoltage

threshold configuration

VMONx overvoltage

threshold configuration

0000

65 %

102.5 %

0001

64.5 %

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

64 %

109.0 %

1110

63.5 %

109.5 %

1111

62 %

110.0 %

Table 33. VMON UV/OV threshold configuration

FS2400

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 4 — 23 October 2024

Document feedback

65 / 151

MFS2401AVBA0ES Datasheet(PDF) 65 Page - NXP Semiconductors

MFS2401AVBA0ES Datasheet(HTML) 65 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL