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MCP47FVB01 数据表(PDF) 59 Page - Microchip Technology |
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MCP47FVB01 数据表(HTML) 59 Page - Microchip Technology |
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59 / 92 page  2015 Microchip Technology Inc. DS20005405A-page 59 MCP47FVBXX 7.3 General Call Commands The MCP47FVBXX acknowledges the General Call Address command (00h in the first byte). General Call commands can be used to communicate to all devices on the I2C bus (at the same time) that understand the General Call command. The meaning of the general call address is always specified in the second byte (see Figure 7-8). If the second byte has a ‘1’ in the LSb, the specification intends this to indicate a “Hardware General Call”. The MCP47FVBXX will ignore this byte and all following bytes (and A), until a Stop bit (P) is encountered. The MCP47FVBXX devices support the following I2C General Call commands: • General Call Reset (06h) • General Call Wake-up (0Ah) The General Call Reset command format is specified by the I2C Specification. The General Call Wake-Up command is a Microchip-defined format. The General Call Wake-Up command will have all devices wake-up (that is, exit the Power-Down mode). The other two I2C Specification command codes (04h and 00h) are not supported, and therefore those commands are Not Acknowledged. If these 7-bit commands conflict with other I2C devices on the bus, then the customer will need two I2C buses and ensure that the devices are on the correct bus for their desired application functionality. FIGURE 7-8: General Call Formats. Note: Refer to the NXP specification #UM10204, Rev. 03 19 June 2007 document for more details on the General Call specifications. The I2C specification does not allow ‘00000000’ (00h) in the second byte. 0 00 0 S 0 000 X XXXX A XX0A P General Call Address Second Byte “7-bit Command” Reserved 7-bit Commands (By I2C™ Specification - NXP specification # UM10204, Rev. 03 19 June 2007) ‘0000 011’ b - Reset and write programmable part of slave address by hardware. ‘0000 010’ b - Write programmable part of slave address by hardware (Not Implemented). ‘0000 000’ b - NOT Allowed MCP47FVBXX 7-bit Commands ‘0000 011’ b - Device Reset (subset of I2C Reserved Command). ‘0000 101’ b - DAC Output Exit Power-Down State (PD1:PD0 = ‘00’). The Following is a “Hardware General Call” Format 0 00 0 S0 0 0 0 X XXXX A XX1A General Call Address Second Byte “7-bit Command” X XXXX XXX AP n occurrences of (Data + A) This indicates a “Hardware General Call” MCP47FVBXX will ignore this byte and all following bytes (and A), until a Stop bit (P) is encountered. |
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