MMPF0100 datasheet(100/136 Pages) FREESCALE

100 / 136 page

LDO\

PF0100

VSNVS

Coin Cell

1.8 - 3.3 V

VIN

2.25 V (VTL0) -

4.5 V

LICELL

Charger

LDO/SWITCH

VREF

Input

Sense/

Selector

2C Interface

Analog Integrated Circuit Device Data

100

Freescale Semiconductor

PF0100

Functional Block Requirements and Behaviors

Power Generation

Figure 25. VSNVS Supply Switch Architecture

Table 107 provides a summary of the VSNVS operation at different input voltage VIN and with or without coin cell connected to

the system.

VSNVS Control

The VSNVS output level is configured through the VSNVSVOLT[2:0]bits on VSNVSCTL register as shown in table Table 108.

VSNVS External Components

Table 107. VSNVS Modes of Operation

VSNVSVOLT[2:0]

VIN

MODE

110

> VTH1

VIN LDO 3.0 V

110

< VTL1

Coin cell switch

000 – 101

> VTH0

VIN LDO

000 – 101

< VTL0

Coin cell LDO

Table 108. Register VSNVSCTL - ADDR 0x6B

Name

Bit #

R/W

Default

Description

VSNVSVOLT

2:0

R/W

0x80

Configures VSNVS output voltage.(62)

000 = 1.0 V

001 = 1.1 V

010 = 1.2 V

011 = 1.3 V

100 = 1.5 V

101 = 1.8 V

110 = 3.0 V

111 = RSVD

UNUSED

7:3

–

0x00

UNUSED

Notes

62.

Only valid when a valid input voltage is present.

Table 109. VSNVS External Components

Capacitor

Value (

μF)

VSNVS

0.47

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