Sensors

18

Freescale Semiconductor, Inc.

MMA16xxKW

3.3

Voltage Regulators

The device derives its internal supply voltage from the HCAP supply voltage. The device includes separate internal voltage

The voltage regulator module includes voltage monitoring circuitry which holds the device in reset following power-on until the

HCAP and internal voltages have stabilized sufficiently for proper operation. The voltage monitor asserts internal reset when the

HCAP supply or internally regulated voltages fall below predetermined levels. A reference generator provides a stable voltage

which is used by the

ΣΔ converter.

Figure 9. Voltage Regulation and Monitoring

3.3.1

3.3.2

The device includes a circuit to monitor the voltage on the HCAP pin. If the voltage falls below the specified threshold in

HCAP

VOLTAGE

REGULATOR

REFERENCE

GENERATOR

DIGITAL

LOGIC

DSP

OTP

ARRAY

OSCILLATOR

ΣΔ

CONVERTER

BIAS

GENERATOR

TRIM

TRIM

BANDGAP

REFERENCE

POR

COMPARATOR

COMPARATOR

HCAP

COMPARATOR

VOLTAGE

REGULATOR

Analog Filter Delay

Analog Filter Delay

Digital Delay

VOLTAGE

REGULATOR