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4.4
Initialization
Following powerup, the device proceeds through an initialization process which is divided into 3 phases:
? Initialization Phase 1: No Data transmissions occur
? Initialization Phase 2: Sensor self-test and transmission of configuration information
? Initialization Phase 3: Transmission of “Sensor Busy”, and “Sensor Ready” / “Sensor Defect” message
Once initialization is completed the device begins normal mode operation, which continues as long as the supply voltage re-
mains within the specified limits.
V IDLE + Δ V SYNC
V IDLE
GND
I IDLE + I MOD
I IDLE
Sync Pulses Ignored or
Program Mode Entry
...
Normal Mode
Sync Pulses
POR
INIT 1
INIT 2
INIT 3
NORMAL MODE
Figure 31. PSI5 Sensor 10-Bit Initialization
During PSI5 initialization, the device completes an internal initialization process consisting of the following:
? Power-on Reset
? Device Initialization
? Program Mode Entry Verification
? Offset Cancellation Initialization (2 Stages)
? Self-Test
Figure 32 shows the timing for internal and external initialization.
PSI5 Initialization
Phase 1
t PSI5_INIT1
PSI5 Initialization
Phase 2
t PSI5_INIT2
PSI5 Initialization
Phase 3
t PSI5_INIT3
PSI5
Normal Mode
POR
Internal
Self-Test
Offset Cancellation Offset Cancellation Raw Offset
Self-Test
Deflection
Self-Test
Normal Data
Self-Test
Repeat
Delay
t INT_INIT
Stage 1
t OC1
Stage 2
t OC2
Calculation
t ST1
Verification
t ST2
Calculation
t ST3
(If Necessary)
ST_RPT * t ST
Sync
Pulses
Ignored
Programming Mode Entry
1) Min. 31 sync pulses
2) PME command
Otherwise
No
PM
Entry
t RS_PM
Sync Pulses Ignored
t PME
PM
Entry
No Transmissions
In Response to
Sync Pulses
t PROG_MODE_START_DELAY
Programming
Mode
Figure 32. Initialization Timing
MMA52xxKW
Sensors
38
Freescale Semiconductor, Inc.
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