3.3.1
V BUF , V REG , and V REGA Regulator Capacitor
The internal regulators require an external capacitor between each of the regulator pins (V BUF , V REG , or V REGA ) and the as-
sociated the V SS / V SSA pin for stability. Figure 1 shows the recommended types and values for each of these capacitors.
3.3.2
V CC , V BUF , V REG , and V REGA Undervoltage Monitor
A circuit is incorporated to monitor the supply voltage (V CC ) and all internally regulated voltages (V BUF , V REG , and V REGA ). If
any of internal regulator voltages fall below the specified undervoltage thresholds in Section 2 , the device will be reset. If V CC
falls below the specified threshold, PSI5 transmissions are terminated for the present response. Once the supply returns above
the threshold, the device will respond to the next detected sync pulse. Reference Figure 9 .
V CC micro-cut occurs
V CC
V BUF
V CC undervoltage detected
V REG
V REGA
Response Terminated
I DATA
POR
Time
Figure 9. V CC Micro-Cut Response
MMA52xxKW
Sensors
Freescale Semiconductor, Inc.
21
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