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ISL22449WFV14Z Datasheet(PDF) 11 Page - Intersil Corporation |
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ISL22449WFV14Z Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 12 page 11 FN6333.2 September 15, 2006 FIGURE 13. THREE BYTE READ SEQUENCE Applications Information Communicating with ISL22449 Communication with ISL22449 proceeds using SPI interface through the ACR (address 1000b), IVRi (addresses 0000b, 0001b, 0010b and 0011b) and WRi (addresses 0000b, 0001b, 0010b and 0011b) registers. The wiper of the potentiometer is controlled by the WRi register. Writes and reads can be made directly to these registers to control and monitor the wiper position without any non-volatile memory changes. This is done by setting MSB bit at address 1000b to 1. The non-volatile IVRi stores the power up value of the wiper. IVRs are accessible when MSB bit at address 1000b is set to 0. Writing a new value to the IVRi register will set a new power up position for the wiper. Also, writing to this register will load the same value into the corresponding WRi as the IVRi. Reading from the IVRi will not change the WRi, if its contents are different. Examples: 0 101 00 I3 I2 I1 I0 R3 R2 R1 R0 SCK SDI CS 00 SDO 0 D6 D5D4 D3 D2 D1D0 DON’T CARE 0 A. Writing to the IVR: This sequence will write a new value (77h) to the IVR2(non-volatile): Set the ACR (Addr 1000b) for NV write (40h) Send the ID byte, Instruction Byte, then the Data byte 0 1 0 1 0 0 0 0 1 1 0 0 1 0 0001 0 0 0 000 (Sent to SDI) Set the IVR (Addr 0010b) to 77h Send the ID byte, Instruction Byte, then the Data byte 0 1 0 1 0 0 0 0 1 1 0 0 0 0 1001 1 1 0 111 (Sent to SDI) B. Reading from the WR: This sequence will read the value from the WR3 (volatile): Write to ACR first to access the volatile WRs Send the ID byte, Instruction Byte, then the Data byte 0 1 0 1 0 0 0 0 1 1 0 0 1 0 0 0 1 1 0 0 0 0 0 0 (Sent to SDI) Read the data from WR3 (Addr 0011b) Send the ID byte, Instruction Byte, then Read the Data byte 0 1 0 1 0 0 0 0 1 0 1 1 0 0 1 1 x x x x x x x x (Out on SDO) ISL22449 |
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