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ISL22419WFU8Z Scheda tecnica(PDF) 10 Page - Intersil Corporation |
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ISL22419WFU8Z Scheda tecnica(HTML) 10 Page - Intersil Corporation |
10 / 13 page 10 FN6311.0 June 28, 2006 The non-volatile IVR and volatile WR registers are accessible with the same address. The Access Control Register (ACR) contains information and control bits described below in Table 2. The VOL bit (ACR[7]) determines whether the access is to wiper registers WR or initial value registers IVR. If VOL bit is 0, the non-volatile IVR register is accessible. If VOL bit is 1, only the volatile WR is accessible. Note, value is written to IVR register also is written to the WR. The default value of this bit is 0. The SHDN bit (ACR[6]) disables or enables Shutdown mode. This bit is logically OR’d with SHDN pin. When this bit is 0, DCP is in Shutdown mode. Default value of SHDN bit is 1. The WIP bit (ACR[5]) is read only bit. It indicates that non- volatile write operation is in progress. The WIP bit can be read repeatedly after a non-volatile write to determine if the write has been completed. It is impossible to write to the WR or ACR while WIP bit is 1. SPI Serial Interface The ISL22419 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 ISL22419. SCK and CS lines are controlled by the host or master. The ISL22419 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 ISL22419 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 3. IDENTIFICATION BYTE FORMAT The next byte sent to the ISL22419 contains the instruction and register pointer information. The four MSBs are the instruction and two LSBs are register address (see Table 4). TABLE 4. 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 1and R0 bit is 0, then the operation is on the ACR. Write Operation A Write operation to the ISL22419 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” and Figure 12. The internal non-volatile write cycle starts after rising edge of CS and takes up to 20ms. Read Operation A read operation to the ISL22419 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 13). 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. TABLE 2. ACCESS CONTROL REGISTER (ACR) BIT # 76 5 432 1 0 BIT NAME VOL SHDN WIP 000 0 0 01010000 (MSB) (LSB) 76543210 I3 I2 I1 I0 0 0 R1 R0 ISL22419 |
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