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ISD5116E Datasheet(PDF) 10 Page - Winbond |
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ISD5116E Datasheet(HTML) 10 Page - Winbond |
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10 / 57 page  October 2000 Page 9 3 OPERATIONAL MODES DESCRIPTION 3.1 I 2C INTERFACE Important note: The rest of this data sheet will assume that the reader is familiar with the I 2C serial interface. Additional information on I 2C may be found in section 9.0 on page 47 of this document. If you are not familiar with this serial protocol, please read this section to familiarize yourself with it. A large amount of additional information on I 2C can also be found on the Philips web page at http://www.philips.com/ . 3.1.1 I 2C Slave Address The ISD5116 has a 7-bit slave address of <100 00xy> where x and y are equal to the state, respectively, of the external address pins A1 and A0. Because all data bytes are required to be 8 bits, the LSB of the address byte is the Read/Write selection bit that tells the slave whether to transmit or receive data. Therefore, there are 8 possible slave addresses for the ISD5116. These are: A1 A0 Slave Address R/W Bit HEX Value 0 0 <100 0000> 0 80 0 1 <100 0001> 0 82 1 0 <100 0010> 0 84 1 1 <100 0011> 0 86 0 0 <100 0000> 1 81 0 1 <100 0001> 1 83 1 0 <100 0010> 1 85 1 1 <100 0011> 1 87 To use more than four ISD5116 devices in an application requires some external switching of the I 2C interface. 3.1.2 ISD5116 I 2c Operation Definitions There are many control functions used to operate the ISD5116. Among them are: 1. READ STATUS COMMAND: The Read Status command is a read request from the Host processor to the ISD5116 without delivering a Command Byte. The Host supplies all the clocks (SCL). In each case, the entity sending the data drives the data line (SDA). The Read Status Command is executed by the following I 2C sequence. 1. Host executes I 2C START 2. Send Slave Address with R/W bit = “1” (Read) 81h 3. Slave (ISD5116) responds back to Host an Acknowledge (ACK) followed by 8-bit Status word 4. Host sends an Acknowledge (ACK) to Slave 5. Wait for SCL to go HIGH 6. Slave responds with Upper Address byte of internal address register 7. Host sends an ACK to Slave 8. Wait for SCL to go HIGH Conventions used in I 2C Data Transfer Diagrams = START Condition = STOP Condition = 8-bit data transfer = “1” in the R/W bit = “0” in the R/W bit = ACK (Acknowledge) = No ACK W S SLAVE ADDRESS R A DATA P = Host to Slave (Gray) = Slave to Host (White) The Box color indicates the direction of data flow = 7-bit Slave Address N |
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