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MAX17823H Datasheet(PDF) 53 Page - Maxim Integrated Products |
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MAX17823H Datasheet(HTML) 53 Page - Maxim Integrated Products |
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53 / 129 page  Data Types The battery-management UART protocol employs several different data types, as described in Table 21. Command Bytes The battery-management UART protocol supports six command types, which are summarized in Table 22. Command Byte Encoding Command bytes encoding is described in Table 23. For READDEVICE and WRITEDEVICE commands, the device address is encoded in the command byte. The device ignores those commands containing a device address other than its own. Table 21. Data Types Table 22. Command-Packet Types Table 23. Command-Byte Encoding Note: z = Total number of devices, ALIVECNTEN = 1, packet size includes framing characters. *Assumes DA[4:0] = 0x00, where DA[4:0] is the device address in the ADDRESS register. DATA TYPE DESCRIPTION Command byte A byte defining the command-packet type, generally either a read or a write. Register address A byte defining the register address to be read or written. Register data Register data bytes being read or written. Data-check byte An error and alert status byte sent and returned with all reads. PEC byte A packet-error checking byte sent and returned with every packet except HELLOALL. Alive counter A byte functioning as a device counter on all reads and writes, if ALIVECNTEN = 1. Fill byte Bytes transmitted in READALL command packets for clocking purposes only. COMMAND DESCRIPTION DATA CHECK PEC ALIVE COUNTER PACKET SIZE (CHARACTERS) HELLOALL Writes a unique device address to each device in the daisy-chain. Required for system initialization. No No No 8 WRITEALL Writes a specified register in all devices. No Yes Yes 14 WRITEDEVICE Writes a specified register in a single device. No Yes Yes 14 READALL Reads a specific register from all devices. Yes Yes Yes 12 + (4z) READDEVICE Reads a specified register from a single device. Yes Yes Yes 16 ROLLCALL Reads the ADDRESS register for 32 devices. Yes Yes Yes 138 COMMAND BYTE* 7 6 5 4 3 2 1 0 HELLOALL 57h 0 1 0 1 0 1 1 1 ROLLCALL 01h 0 0 0 0 0 0 0 1 WRITEDEVICE 04h DA4 3 DA2 DA1 DA0 1 0 0 WRITEALL 02h 0 0 0 0 0 0 1 0 READDEVICE 05h DA4 DA3 DA2 DA1 DA0 1 0 1 READALL 03h 0 0 0 0 0 0 1 1 MAX17823H 12-Channel, High-Voltage Data-Acquisition Systems www.maximintegrated.com Maxim Integrated │ 53 |
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