MMA6222AEG

Sensors

6

Freescale Semiconductor

1.4.11

ST

This pin performs a dual function. When driven to a logic high level, the internal self-test voltage generator is activated. A low-to-

high transition on this pin will clear the internal STATUS latch. Note that under certain fault conditions, the STATUS latch will be

immediately reset, indicating a terminal fault condition.

A diagram illustrating operation of the STATUS latch following device initialization is illustrated in Figure 1-5.

Figure 1-5 ST and STATUS Interaction

1.4.12

CAP/HOLD

When this input pin is low, acceleration data is updated by the DSP whenever a data sample becomes available. Upon a low-to-

high transition of CAP/HOLD acceleration data is frozen. Acceleration data is not updated as long as the pin remains at a logic

1.4.13

Two digital-to-analog converters (DACs) are provided. These converters translate output of the DSP block into voltage levels pro-

1.5

EXTERNAL COMPONENTS

The connections illustrated in Figure 1-1 are recommended. Careful printed wiring board layout and component placement is es-

grounded land area with solder mask should be placed under the package for improved shielding of the device from external

effects. If a land area is not provided, no signals should be routed beneath the package. See Figure 1-1.

ST

FAULT DETECT

SELF TEST ENABLE

D

R

Q

STATUS