MMPF0100 datasheet(23/136 Pages) NXP

23 / 136 page

NXP Semiconductors

PF0100

FUNCTIONAL BLOCK REQUIREMENTS AND BEHAVIORS

6.1.2.4

Soft start ramp rate

The start-up ramp rate or soft start ramp rate can be chosen from the same options as shown in 6.4.4.2.1 Dynamic voltage scaling, page

35.

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 concerned with OTP is shown in Table 137 and Table 138.

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

depend on the setting of the VDDOTP pin and on the value of the TBB_POR and FUSE_POR_XOR bits. Refer to Table 16.

• 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_XOR = 1, the values are loaded from the fuses. In the MMPF0100,

FUSE_POR1, FUSE_POR2, and FUSE_POR3 are XOR’ed into the FUSE_POR_XOR bit. The FUSE_POR_XOR has to be 1 for

fuses to be loaded. This can be achieved by setting any one or all of the FUSE_PORx bits. In the MMPF0100A, the XOR function

is removed. 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_XOR = 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_XOR = 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 parameters which can be programmed are shown in the TBBOTP registers in Table 137. Extended page 1, page 111 of the register

map. The PF0100 offers ECC, the control registers for which functions are located in Extended Page 2 of the register map. There are ten

banks of twenty-six fuses each which can be programmed. Programming the fuses requires an 8.25 V, 100 mA supply powering the

VDDOTP pin, bypassed with 10 to 20

μF of capacitance. For more details on programming the OTP fuses, see application note AN4536.

100

0x0C

101

0x0D

110

0x0E

111

0x0F

Table 15. I2C address configuration (continued)

I2C_SLV_ADDR[3]

hard coded

I2C_SLV_ADDR[2:0]

I2C device address

(Hex)

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