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LTC1392 Datasheet(PDF) 7 Page - Linear Technology |
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LTC1392 Datasheet(HTML) 7 Page - Linear Technology |
7 / 12 page 7 LTC1392 APPLICATIONS INFORMATION MSB-First Data (MSBF = 1) tCYC CS START SEL1 SEL0 SEL1 SEL0 MSBF tSMPL Hi-Z Hi-Z FILLED WITH ZEROS DIN DOUT B9 B8 B7 B6 B5 B4 B3 B2 B1 tCONV B0 CLK tsuCS tWAKEUP tCYC CS START MSBF Hi-Z Hi-Z LTC1392 • F01 FILLED WITH ZEROS DIN DOUT B9 B8 B7 B6 B5 B4 B3 B2 B1 tCONV B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 CLK tsuCS tWAKEUP tSMPL Figure 1 temperature measurement or a 10 µs delay for other mea- surements, followed by a 4-bit input word which config- ures the LTC1392 for the current conversion. This data word is shifted into the DIN input. DIN is then disabled from shifting in any data and the DOUT pin is configured from three-state to an output pin. A null bit and the result of the current conversion are serially transmitted on the falling CLK edge onto the DOUT line. The format of the A/D result can be either MSB-first sequence or MSB-first sequence followed by an LSB-first sequence. This provides easy interface to MSB- or LSB-first serial ports. Bringing CS high resets the LTC1392 for the next data exchange. INPUT DATA WORD Data transfer is initiated by a falling chip select (CS) signal. After CS falls, the LTC1392 looks for a start bit. Once the start bit is received, the next three bits are shifted into the DIN input which configures the LTC1392 and starts the conversion. Further inputs on the DIN input are then ignored until the next CS cycle. The four bits of the input word are defined as follows: BIT 3 BIT 2 BIT 1 BIT 0 Start Select 1 Select 0 MSBF Start Bit The first “logic one” clocked into the DIN input after CS goes low is the Start Bit. The Start Bit initiates the data transfer and all leading zeros which precede this logical one will be ignored. After the Start Bit is received the remaining bits of the input word will be clocked in. Further input on the DIN pin are then ignored until the next CS cycle. |
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