MMPF0100Z datasheet(22/128 Pages) NXP

22 / 128 page

NXP Semiconductors

PF0100Z

FUNCTIONAL BLOCK REQUIREMENTS AND BEHAVIORS

6.1.3

OTP prototyping

Before permanently programming fuses, it is possible to test the desired configuration by using the “try before buy” feature. With this

feature, the configuration is loaded from the OTP registers. These registers merely serve as temporary storage for the values to be written

to the fuses, for the values read from the fuses, or for the values read from the default configuration. To avoid confusion, these registers

are referred to as the TBBOTP registers. The portion of the register map concerning OTP is shown in Table 136 and Table 137.

The contents of the TBBOTP registers are initialized to zero when a valid VIN is first applied. The values then loaded into the TBBOTP

registers depend on the setting of the VDDOTP pin and on the value of the TBB_POR and FUSE_POR bits. Refer to Table 15.

• If VDDOTP = VCOREDIG (1.5 V), the values are loaded from the default configuration.

• If VDDOTP = 0.0 V, TBB_POR = 0 and FUSE_POR = 1, the values are loaded from the fuses. In the MMPF0100Z, FUSE_POR1,

FUSE_POR2, and FUSE_POR3 are XOR’ed into the FUSE_POR_XOR bit. The FUSE_POR_XOR must be 1 for fuses to be loaded.

This is achieved by setting any one or all of the FUSE_PORx bits. The XOR function is removed in the MMPF0100AZ. It is required

to set all of the FUSE_PORx bits to be able to load the fuses.

• If VDDOTP = 0.0 V, TBB_POR = 0 and FUSE_POR = 0, the TBBOTP registers remain initialized at zero.

The initial value of TBB_POR is always “0”; only when VDDOTP = 0.0 V and TBB_POR is set to “1” are the values from the TBBOTP

registers maintained and not loaded from a different source.

The contents of the TBBOTP registers are modified by I2C. To communicate with I2C, VIN must be valid and VDDIO, to which SDA and

SCL are pulled up, must be powered by a 1.7 V to 3.6 V supply. VIN, or the coin cell voltage must be valid to maintain the contents of the

registers. To power on with the contents of the TBBOTP registers, the following conditions must exist; VIN is valid, VDDOTP = 0.0 V,

TBB_POR = 1, and there is a valid turn-on event. Refer to the application note AN4536 for an example of prototyping.

6.1.4

Reading OTP fuses

As described in the previous section, the contents of the fuses are loaded to the TBBOTP registers when the following conditions are met;

VIN is valid, VDDOTP = 0.0 V, TBB_POR = 0 and FUSE_POR = 1. If ECC were enabled at the time the fuses were programmed, the error

corrected values can be loaded into the TBBOTP registers if desired. Once the fuses are loaded and a turn-on event occurs, the PMIC

powers on with the configuration programmed in the fuses. For more details on reading the OTP fuses, see application note AN4536.

6.1.5

Programming OTP fuses

The programmable parameters are shown in the TBBOTP registers in the Table 136. Extended page 1, page 106 of the register map. The

PF0100AZ offers ECC, the control registers for which functions are located in Table 137. Extended page 2, page 110 of the register map.

There are ten banks of twenty-six fuses each which can be programmed. For more details on programming the OTP fuses, see application

note AN4536.

Table 15. Source of start-up sequence

VDDOTP(V)

TBB_POR

FUSE_POR

Start-up sequence

None

OTP fuses

TBBOTP registers

1.5

Factory defined

MMPF0100Z Datasheet(PDF) 22 Page - NXP Semiconductors

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