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ADIS16003 Datasheet(PDF) 11 Page - Analog Devices |
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ADIS16003 Datasheet(HTML) 11 Page - Analog Devices |
11 / 16 page ADIS16003 Rev. 0 | Page 11 of 16 THEORY OF OPERATION ACCELEROMETER SERIAL INTERFACE 12 4 10 11 6 5 8 9 7 3 2 1 8 9 7 3 2 1 12 4 10 11 6 5 Top View Not to Scale DIGITAL OUTPUT (IN LSBs) X-AXIS: 1229 Y-AXIS: 2048 DIGITAL OUTPUT (IN LSBs) X-AXIS: 2867 Y-AXIS: 2048 DIGITAL OUTPUT (IN LSBs) X-AXIS: 2048 Y-AXIS: 2867 DIGITAL OUTPUT (IN LSBs) X-AXIS: 2048 Y-AXIS: 1229 DIGITAL OUTPUT (IN LSBs) X-AXIS: 2048 Y-AXIS: 2048 Figure 3 shows the detailed timing diagram for serial inter- facing to the accelerometer in the ADIS16003. The serial clock provides the conversion clock. CS initiates the data transfer and conversion process and frames the serial data transfer for the accelerometer output. The accelerometer output is sampled on the second rising edge of the SCLK input after the falling edge of the CS. The conversion requires 16 SCLK cycles to complete. The rising edge of Figure 23. Output Response vs. Orientation The ADIS16003 is a low cost, low power, complete dual-axis accelerometer with an integrated serial peripheral interface (SPI) and an integrated temperature sensor whose output is also available on the SPI interface. The ADIS16003 is capable of measuring acceleration with a full-scale range of ±1.7 g (minimum). It can also measure both dynamic acceleration (vibration) and static acceleration (gravity). SELF-TEST The ST pin controls the self-test feature. When this pin is set to VCC, an electrostatic force is exerted on the beam of the acceler- ometer. The resulting movement of the beam allows the user to test if the accelerometer is functional. The typical change in output is 750 mg (corresponding to 614 LSB) for VCC = 5.0 V. This pin may be left open-circuit or connected to common in normal use. The ST pin should never be exposed to voltage greater than VCC + 0.3 V. If the system design is such that this condition cannot be guaranteed (for example, multiple supply voltages present), a low VF clamping diode between ST and VCC is recommended. SERIAL INTERFACE The serial interface on the ADIS16003 consists of five wires, CS, TCS, SCLK, DIN, and DOUT, with the temperature sensor’s serial interface in parallel with the accelerometer’s serial interface. The CS and TCS are used to select the accelerometer or temperature sensor outputs, respectively. CS and TCS cannot be active at the same time. The SCLK input accesses data from the internal data registers. CS CS puts the bus back into three-state. If remains low, the next digital conversion is initiated. The details for the control register bit functions are shown in Table 6. Accelerometer Control Register MSB LSB DONTC ZERO ZERO ZERO ADD0 ONE ZERO PM0 Table 6. Accelerometer Control Register Bit Functions Bit Mnemonic Comments 7 DONTC Don’t care. Can be one or zero. ZERO These bits should be held low. 6, 5, 4 3 ADD0 This address bit selects the x-axis or y-axis outputs. Zero selects the x-axis; one selects the y-axis. 2 ONE This bit should be held high. 1 ZERO This bit should be held low. 0 PM0 This bit selects the operation mode for the accelerometer; set to zero for normal operation and one for power down mode. Power Down By setting PM0 to one when updating the accelerometer control register, the ADIS16003 goes into a shutdown mode. The information stored in the control register is maintained during shutdown. The ADIS16003 changes modes as soon as the control register is updated. If the part is in shutdown mode and PM0 is changed to zero, then the part powers up on the sixteenth SCLK rising edge. ADD0 By setting ADD0 to zero when updating the accelerometer control register, the x-axis output is selected. By setting ADD0 to one, the y-axis output is selected. ZERO ZERO is defined as the logic low level. ONE ONE is defined as the logic high level. DONTC DONTC is defined as don’t care; can be a low or high logic level. |
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