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MMA5124LCWR2 Datasheet(PDF) 39 Page - NXP Semiconductors |
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MMA5124LCWR2 Datasheet(HTML) 39 Page - NXP Semiconductors |
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39 / 59 page  Sensors NXP Semiconductors 39 MMA51xxL 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 remains within the specified limits. Figure 32. 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 33 shows the timing for internal and external initialization. Figure 33. Initialization Timing INIT 1 INIT 3 NORMAL MODE INIT 2 Normal Mode ... POR GND VIDLE VIDLE+ ΔVSYNC IIDLE IIDLE + IMOD Sync Pulses Ignored or Program Mode Entry Sync Pulses tINT_INIT tPSI5_INIT1 Self-Test Raw Offset Calculation PSI5 Initialization Phase 1 tPSI5_INIT2 tPSI5_INIT3 PSI5 Initialization Phase 2 PSI5 Initialization Phase 3 PSI5 Normal Mode POR Internal Delay tOC1 Offset Cancellation Stage 1 tST1 Self-Test Deflection Verification tST2 Self-Test Normal Data Calculation tST3 ST_RPT * tST Self-Test Repeat (If Necessary) tOC2 Offset Cancellation Stage 2 Programming Mode Entry 1) Min. 31 sync pulses 2) PME command Sync Pulses Ignored tRS_PM tPME No PM Entry PM Entry tPROG_MODE_START_DELAY No Transmissions In Response to Sync Pulses Programming Mode Otherwise Sync Pulses Ignored |
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