MMPF0100Z datasheet(24/128 Pages) NXP

24 / 128 page

NXP Semiconductors

PF0100Z

FUNCTIONAL BLOCK REQUIREMENTS AND BEHAVIORS

6.3.1.1

External components

6.3.2

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 uses a voltage follower to drive the load.

Figure 7. VREFDDR block diagram

6.3.2.1

VREFDDR control register

The VREFDDR voltage reference is controlled by a single bit in VREFDDCRTL register in Table 19.

VCOREREF (bandgap / regulator reference)

VCOREREF

Output voltage (28)

–1.2

–

VCOREREFACC

Absolute accuracy

–

0.5

–

VCOREREFTACC

Temperature drift

–

0.25

–

Notes

28.

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

29.

For information only

Table 18. External components for core voltages

Regulator

Capacitor value (

μF)

VCOREDIG

1.0

VCORE

1.0

VCOREREF

0.22

Table 17. Core voltages electrical specifications(29) (continued)

PF0100Z TA = -40 °C to 85 °C, PF0100AZ TA = -40 °C to 105 °C, VIN = 2.8 V to 4.5 V, LICELL = 1.8 V 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.

Symbol

Parameters

Min.

Typ.

Max.

Units

Notes

VINREFDDR

VREFDDR

VINREFDDR

CHALF1

Discharge

VHALF

VREFDDR

CHALF2

100 nf

CREFDDR

1.0 uf

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