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DAC53401_V01 データシート(Datasheet) 15 Page - Texas Instruments

部品番号. DAC53401_V01
部品情報  DACx3401 10-Bit and 8-Bit, Voltage-Output Digital-to-Analog Converters With Nonvolatile Memory and PMBus™ Compatible I2C Interface in Tiny 2 × 2 WSON
ダウンロード  43 Pages
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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ALERT
CONTROL
DATA
CLOCK
ALERT
CONTROL
DATA
CLOCK
ALERT
CONTROL
DATA
CLOCK
PMBus-compatible device #1
Alert signal
Control signal
Data
Clock
Optional
Required
PMBus-compatible device #2
PMBus-compatible device #3
15
DAC53401, DAC43401
www.ti.com
SLASES7 – JULY 2019
Product Folder Links: DAC53401 DAC43401
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Copyright © 2019, Texas Instruments Incorporated
8.3.8 PMBus Compatibility
PMBus is an I2C-based communication standard for power-supply management. PMBus contains standard
command codes tailored to power supply applications. The DACx3401 implements some PMBus commands
such as Turn Off, Turn On, Margin Low, Margin High, Communication Failure Alert Bit (CML), as well as PMBUS
revision. Figure 3 shows typical PMBus connections
Similar to I2C, PMBus is a variable length packet of 8-bit data bytes, each with a receiver acknowledge, wrapped
between a start and stop bit. The first byte is always a 7-bit slave address followed by a write bit, sometimes
called the even address that identifies the intended receiver of the packet. The second byte is an 8-bit command
byte, identifying the PMBus command being transmitted using the respective command code. After the command
byte, the transmitter either sends data associated with the command to write to the receiver command register
(from most significant byte to least significant byte), or sends a new start bit indicating the desire to read the data
associated with the command register from the receiver. After, the receiver transmits the data following the same
lowest-byte first format (see Table 10).
Figure 3. PMBus Connections




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