MPF0900AMBA2ES datasheet(85/205 Pages) NXP

85 / 205 page

NXP Semiconductors

PF09

Nine-channel power management IC with advanced system safety monitoring

The PF09 provides various mechanisms on the I2C communication protocol to ensure proper communication

and avoid system failures that could be caused by incorrect data.

12.8.14.1 I2C CRC verification

The I2C CRC mechanism is provide to verify the integrity of each I2C transaction. The CRC is enabled via the

OTP_I2C_CRC_EN bit.

OTP_I2C_CRC_EN

I2C CRC

Disabled

Enabled

Table 102. Enabling the I2C CRC mechanism

The CRC calculation is based on the standard CRC-8-SAE as defined in the SAE-J1850 specificationn with the

following characteristics.

Polynomial = 0x1D

Initial value = 0xFF

The CRC byte is calculated by shifting 24-bit data through the CRC polynomial. The 24-bit package is built as

follows:

DEVICE_ADDR[b8] + REGISTER_ADDR [b8] +DATA[b8]

The DEVICE_ADDR is calculated as the seven-bit secondary address shifted left one space plus the

corresponding read/write bit. (7Bit Address [b7] << 1 ) + R/W = DEVICE_ADDR[b8]

aaa-056069

DEVICE_ADDR

[6:0]

R/W

[1]

MSB

data

REGISTER_ADDR

[7:0]

Polynominal = 0x1D

x8 + x4 + x3 + x2 + 1

Seed = 1111 1111

DATA

[7:0]

Figure 24. I2C CRC Polynomial

During an I2C write command, the MCU must calculate the CRC byte and send it after the data byte in the I2C

package, to make a total of 32 bits per transaction.

After each I2C write transaction, the device calculates the corresponding CRC byte internally and compares it to

the CRC sent by the MCU, to ensure the configuration command has not been corrupted.

When a CRC fault is detected, the device ignores the current configuration command and sets the I2C_CRC_I.

the I2C CRC interrupt will assert the INTB pin if the interrupt is not masked.

12.8.14.2 I2C secure write

A secure write protocol is implemented for specific registers critical to the functional safety of the device. The

secure write functionality is enabled by the I2C_SECURE_EN bit, and the default value is set at power up via

the OTP_I2C_SECURE_EN bit.

PF09

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

Product data sheet

Rev. 1.3 — 16 December 2025

Document feedback

85 / 205

MPF0900AMBA2ES Datasheet(PDF) 85 Page - NXP Semiconductors

MPF0900AMBA2ES Datasheet(HTML) 85 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