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MMA8225EG Datasheet(PDF) 9 Page - Freescale Semiconductor, Inc |
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MMA8225EG Datasheet(HTML) 9 Page - Freescale Semiconductor, Inc |
9 / 49 page MMA81XXTKEG Sensors Freescale Semiconductor 9 SECTION 2 SUPPORT MODULES 2.1 MASTER OSCILLATOR A temperature-compensated internal oscillator provides a stable timing reference for the device. The oscillator is factory-trimmed to operate at a nominal frequency of 4 MHz. 2.2 VOLTAGE REGULATION The internal voltage regulator has minimum voltage level detection, which will hold the device in reset and prevent data transmission should the regulator output fall during operation. The regulator also has an input voltage clamp to limit the power dissipated in the regulator during voltage spikes on the HCAP pin which might come from the two or three wire satellite bus. 2.3 BESSEL FILTER 180-Hz, 2-pole and 400 Hz 4-pole Bessel filter options are provided. The low-pass filter is implemented within a two stage switched capacitor amplifier. The overall gain of the Bessel filter is set to a fixed value. The output of the Bessel filter output acts as the input to the A/D converter and is also buffered and made available at the CFIL pin. 2.4 STATUS MONITORING A number of abnormal conditions are detected by MMA81XXTKEG/MMA82XXTKEG and the behavior of the device altered if a fault is detected. Detected fault conditions and consequent device behavior is summarized in the table below. Certain conditions, e.g. ground loss, are qualified by device configuration. Figure 2-1 provides a representation of fault conditions, applicable quali- fiers and effects. Table 2-1 Fault Condition Response Summary Condition Description Device Behavior Undervoltage, CREG Internally regulated voltage below operating level Device continuously undergoes reset, bus switch open, no response to DSI commands Sustained Undervoltage, HCAP Voltage at HCAP below operating level for more than 1 ms Frame Timeout Bus voltage remains below frame threshold (tTO) longer than specified time. Transient Undervoltage, HCAP Voltage at HCAP below operating level for less than 1 ms Undervoltage (U) flag set, short-word Read Acceleration Data response value equals zero Fuse Fault OTP fuse threshold failure Accelerometer Status (S) flag set, short-word Read Acceleration Data response value equals zero Parity Fault Parity failure detected in factory or customer programmed OTP data Ground Fault Ground loss detected for more than 4.096 ms Accelerometer Status (S) and Ground Fault (GF) flags set, short-word Read Acceleration Data response value equals zero |
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