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MCP4716 Datasheet(PDF) 54 Page - Microchip Technology |
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MCP4716 Datasheet(HTML) 54 Page - Microchip Technology |
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54 / 86 page  MCP4706/4716/4726 DS22272A-page 54 © 2011 Microchip Technology Inc. 6.5 READ COMMAND This command reads all the device memory. This includes the volatile and nonvolatile (EEPROM) DAC Register values and configuration bits, and the volatile status bits. This command is executed when the I2C control byte’s Read/Write bit is a ‘1’ (read). This command has two different formats based on the resolution of the device. The 12-bit and 10-bit devices use the format in Figure 6-5, while the 8-bit device uses the format in Figure 6-6. The 2nd byte (configuration bits) indicates the current condition of the device operation. The RDY/BSY bit indicates EEPROM writing status. FIGURE 6-5: Read Command Format for 12-bit DAC (MCP4726) and 10-bit DAC (MCP4716). Device Addressing Note 1: The 2nd - 7th bytes can be repeated after the 7th byte by continued clocking before issuing Stop bit. 2: ACK bit generated by MCP47X6. 3: ACK bit generated by I2C Master. b15 b14 b13 b12 b11 b10 b09 b08 b07 b06 b05 b04 b03 b02 b01 b00 MCP4726 D11 D10 D09 D08 D07 D06 D05 D04 D03 D02 D01 D00 0 0 0 0 MCP4716 D09 D08 D07 D06 D05 D04 D03 D02 D01 D00 0 0 0 0 0 0 SDA SCL A2 A1 A0 11 0 0 1 0 PD1 PD0 G Data bits (16 bits) (3rd + 4th bytes, and 6th + 7th bytes) Start bit ACK bit (3) Read/Write bit (Read) S A R/W Legend: D11:D00 = 12-bit data for MCP4726 device D09:D00 = 10-bit data for MCP4716 device 0 VREF1 VREF0 A RDY POR Vol. Data bits (8 bits) (4th byte) b08 0 b07 b06 b05 b04 b03 b02 b01 b00 0 A 0 b15 b14 b13 b12 b11 b10 b09 A Vol. Data bits (8 bits) (3rd byte) ACK bit (4) ACK bit (4) Note 1 Stop bit A/N P ACK/NACK bit (5) NV Data bits (8 bits) (7th byte) b08 0 b07 b06 b05 b04 b03 b02 b01 b00 0/1 A 0 b15 b14 b13 b12 b11 b10 b09 A NV Data bits (8 bits) (6th byte) ACK bit (4) ACK bit (4) ACK bit (4) PD1 PD0 G 1 VREF1 VREF0 RDY POR Vol. Vol. Configuration Status bits bits Vol. NV Configuration Status bits bits 4: ACK/NACK bit generated by I2C Master. |
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