データシートサーチシステム |
|
ISL22416WFRT10Z データシート(PDF) 11 Page - Intersil Corporation |
|
ISL22416WFRT10Z データシート(HTML) 11 Page - Intersil Corporation |
11 / 14 page 11 FN6227.2 September 9, 2009 Shutdown Mode The device can be put in Shutdown mode either by pulling the SHDN pin to GND or setting the SHDN bit in the ACR register to 0. The truth table for Shutdown mode is in Table 3. SPI Serial Interface The ISL22416 supports an SPI serial protocol, mode 0. The device is accessed via the SDI input and SDO output with data clocked in on the rising edge of SCK, and clocked out on the falling edge of SCK. CS must be LOW during communication with the ISL22416. SCK and CS lines are controlled by the host or master. The ISL22416 operates only as a slave device. All communication over the SPI interface is conducted by sending the MSB of each byte of data first. Protocol Conventions The first byte sent to the ISL22416 from the SPI host is the Identification Byte. A valid Identification Byte contains 0101 as the four MSBs, with the following four bits set to 0. TABLE 4. IDENTIFICATION BYTE FORMAT The next byte sent to the ISL22416 contains the instruction and register pointer information. The four MSBs are the instruction and two LSBs are register address (see Table 5). TABLE 5. IDENTIFICATION BYTE FORMAT There are only two valid instruction sets: 1011(binary) - is a Read operation 1100(binary) - is a Write operation There are only two registers address possible for this DCP. If the R1, R0 bits are zero, then the read or write is to either the IVR or the WR register (depends of VOL bit at ACR). If the R1 bit is 1 and R0 bit is 0, then the operation is on the ACR. Write Operation A Write operation to the ISL22416 is a three-byte operation. It requires first, the CS transition from HIGH to LOW, then a valid Identification Byte, then a valid instruction byte followed by Data Byte is sent to SDI pin. The host terminates the write operation by pulling the CS pin from LOW to HIGH. For a write to address 0 (WR), the byte at address 2 (ACR<7>) determines if the Data Byte is to be written to volatile or both volatile and non-volatile registers. Refer to “Memory Description” on page 10 and Figure 16. The internal non-volatile write cycle starts after rising edge of CS and takes up to 20ms. Read Operation A read operation to the ISL22416 is a three byte operation. It requires first, the CS transition from HIGH to LOW, then a valid Identification Byte, then a valid instruction byte followed by “dummy” Data Byte is sent to SDI pin. The SPI host reads the data from SDO pin on falling edge of SCK. The host terminates the read operation by pulling the CS pin from LOW to HIGH (see Figure 17). In order to read back the non-volatile IVR, it is recommended that the application reads the ACR first to verify the WIP bit is 0. If the WIP bit (ACR[5]) is not 0, the host should repeat its reading sequence again. Applications Information Communicating with ISL22416 Communication with ISL22416 proceeds using SPI interface through the ACR (address 10b), IVR (address 00b) and WR (address 00b) registers. The wiper of the potentiometer is controlled by the WR register. Writes and reads can be made directly to this register to control and monitor the wiper position without any non-volatile memory changes. This is done by setting MSB bit at address 10b to 1. The non-volatile IVR stores the power up value of the wiper. IVR is accessible when MSB bit at address 10b is set to 0. Writing a new value to the IVR register will set a new power up position for the wiper. Also, writing to this register will load the same value into the WR as the IVR. Reading from the IVR will not change the WR, if its contents are different. TABLE 3. SHUTDOWN MODE SHDN PIN SHDN BIT MODE High 1 Normal operation Low 1 Shutdown High 0 Shutdown Low 0 Shutdown 01010000 (MSB) (LSB) 76543210 I3 I2 I1 I0 0 0 R1 R0 ISL22416 |
同様の部品番号 - ISL22416WFRT10Z |
|
同様の説明 - ISL22416WFRT10Z |
|
|
リンク URL |
プライバシーポリシー |
ALLDATASHEET.JP |
ALLDATASHEETはお客様のビジネスに役立ちますか? [ DONATE ] |
Alldatasheetは | 広告 | お問い合わせ | プライバシーポリシー | リンク交換 | メーカーリスト All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |