MMA685X datasheet(21/52 Pages) FREESCALE

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Freescale Semiconductor, Inc.

MMA685x

3.3

Voltage Regulators

Separate internal voltage regulators supply the analog and digital circuitry. External filter capacitors are required, as shown in

Figure 1. The voltage regulator module includes voltage monitoring circuitry which indicates a device reset until the external sup-

ply and all internal regulated voltages are within predetermined limits. A reference generator provides a stable voltage which is

used by the

ΣΔ converters.

Figure 7. Power Supply

Figure 8. Voltage Monitoring

CREGA

CREG

VCC

TRACKING

REGULATOR

VOLTAGE

REGULATOR

REFERENCE

GENERATOR

VREGA = 2.50 V

DIGITAL

LOGIC

DSP

OTP

ARRAY

PRIMARY

OSCILLATOR

ΣΔ

CONVERTER

BIAS

GENERATOR

TRIM

VREF = 1.250 V

VREG = 2.50 V

BANDGAP

REFERENCE

Tracks VREGA

SET DEVRES Flag

VCC

VREGA

VREG

VREF

MONITOR

BANDGAP

VCCUV

VREGOV

VREGUV

VREGAUV

VREGAOV

VREFOV

VREFUV

GROUND LOSS

MONITOR

VREG

POR

VBGMON

VPORREF

Note: No external access to reference voltage

Limits verified by characterization only

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