MMPF0100 datasheet(25/136 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

PF0100

Functional Block Requirements and Behaviors

Bias and References Block Description

7.3.1.1

External Components

7.3.2

VREFDDR Voltage Reference

VREFDDR is an internal PMOS half supply voltage follower capable of supplying up to 10 mA. The output voltage is at one half

the input voltage. Its typically used as the reference voltage for DDR memories. A filtered resistor divider is utilized to create a

low frequency pole. This divider then utilizes a voltage follower to drive the load.

Table 17. Core Voltages Electrical Specifications(21)

TA = -40 to 85 °C, VIN = 2.8 to 4.5 V, LICELL = 1.8 to 3.3 V, and typical external component values. Typical values are

characterized at VIN = 3.6 V, LICELL = 3.0 V, and 25 °C, unless otherwise noted.

Parameters

Symbol

Min

Typ

Max

Units

VCOREDIG (DIGITAL CORE SUPPLY)

Output Voltage

ON mode (20)

Coin cell mode and OFF

VCOREDIG

–

1.5

1.3

–

VCORE (ANALOG CORE SUPPLY)

Output Voltage

ON mode and charging(20)

OFF and Coin cell mode

VCORE

–

2.775

0.0

–

VCOREREF (BANDGAP / REGULATOR REFERENCE)

Output Voltage(20)

VCOREREF

–1.2

–

Absolute Accuracy

VCOREREFACC

–0.5

–

Temperature Drift

VCOREREFTACC

–0.25

–

Notes

20.

3.0 V < VIN < 4.5 V, no external loading on VCOREDIG, VCORE, or VCOREREF. Extended operation down to UVDET, but no system

malfunction.

21.

For information only.

Table 18. External Components for Core Voltages

Regulator

Capacitor Value (

μF)

VCOREDIG

1.0

VCORE

1.0

VCOREREF

0.22

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