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CAT5132Z-100TE13 Datasheet(PDF) 9 Page - Catalyst Semiconductor |
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CAT5132Z-100TE13 Datasheet(HTML) 9 Page - Catalyst Semiconductor |
9 / 13 page CAT5132 9 Doc No. 25092, Rev. 00 © 2005 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice Wiper Control Register (WCR) Description The CAT5132 contains a 7-bit Wiper Control Register which is decoded to select one of the 128 switches along its resistor array. The WCR is a volatile register and is written with the contents of the nonvolatile Data Register (DR) on power-up. The Wiper Control Register loses its contents when the CAT5132 is powered-down. The contents of the WCR may be read or changed directly by the host using a READ/WRITE command after addressing the WCR (see Table 1 to access WCR). Since the CAT5132 will only make use of the 7 LSB bits (The first data bit, or MSB, is ignored) on write instructions and will always come back as a “0” on read commands. XXXXXXX AX Ah 2 0 - s s e r d d a R T S 0 1 0 1 0 00 0 A 00 0 0 0 0 1 0 A 1 0 0 0 0 0 0 0 A P S 1st byte 2nd byte 3rd byte WCR(80h) selection T S 0 1 0 1 0 00 0 A 00 0 0 0 0 0 0 A P S slave address byte WCR address - 00h data byte 111 A1 Ah 2 0 - s s e r d d a R T S 0 1 0 1 0 00 0 A 00 0 0 0 0 1 0 A 1 0 0 0 0 0 0 0 1st byte 2nd byte 3rd byte ASP WCR(80h) selection T S 0 1 0 1 1 00 0 A 00 0 0 0 0 0 0 SP slave address byte WCR address - 00h increment (1) / decrement (0) bits 00 0 0 Ah 2 0 - s s e r d d a R T S 0 1 0 1 0 00 0 A 00 0 0 0 0 1 0 A 1 0 0 0 0 0 0 0 WCR(80h) selection T S 0 1 0 1 0 00 0 A 00 0 0 0 0 0 0 slave address byte WCR address - 00h T S 0 1 0 1 0 00 1 A 0X X X X X X X slave address byte data byte SP 1st byte 2nd byte 3rd byte ASP A write operation (see Table 3) requires a Start condition, followed by a valid slave address byte, a valid address byte 00h, a data byte and a STOP condition. After each of the three bytes the CAT5132 responds with an acknowledge. At this time the data is written only to volatile registers, then the device enters its standby state. An increment operation (see Table 4) requires a Start condition, followed by a valid increment address byte (01011), a valid address byte 00h. After each of the two bytes, the CAT5132 responds with an acknowledge. At this time if the data is high then the wiper is incremented or if the data is low the wiper is decremented at each clock. Once the stop is issued then the device enters its standby state with the WCR data as being the last inc/dec position. Also, the wiper position does not roll over but is limited to min and max positions. A read operation (see Table 5) requires a Start condition, followed by a valid slave address byte for write, a valid address byte 00h, a second START and a second slave address byte for read. After each of the three bytes, the CAT5132 responds with an acknowledge and then the device transmits the data byte. The master terminates the read operation by issuing a STOP condition following the last bit of Data byte. Table 3. WCR Write Operation Table 4. WCR Increment/Decrement Operation Table 5. WCR Read Operation |
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