Datasheet
Table Of Contents
- BENEFITS AND FEATURES
- PIN CONFIGURATIONS
- ORDERING INFORMATION
- DESCRIPTION
- PIN DESCRIPTION
- OPERATION
- READING FROM THE CLOCK REGISTERS
- SPECIAL PURPOSE REGISTERS
- CONTROL REGISTER (READ 0Fh, WRITE 8Fh)
- TRICKLE CHARGE REGISTER (READ 11H, WRITE 91H)
- Figure 3. PROGRAMMABLE TRICKLE CHARGER
- POWER CONTROL
- Figure 4. POWER-SUPPLY CONFIGURATIONS
- SERIAL PERIPHERAL INTERFACE (SPI)
- ADDRESS AND DATA BYTES
- Figure 6. SPI SINGLE-BYTE WRITE
- Figure 7. SPI SINGLE-BYTE READ
- Figure 8. SPI MULTIPLE-BYTE BURST TRANSFER
- FUNCTION
- READING AND WRITING IN BURST MODE
- OPERATING RANGE
- RECOMMENDED DC OPERATING CONDITIONS (Over the operating range, unless otherwise specified.)
- DC ELECTRICAL CHARACTERISTICS (Over the operating range, unless otherwise specified.)
- CAPACITANCE (TA = +25C)
- Figure 10. TIMING DIAGRAM: 3-WIRE READ DATA TRANSFER
- SPI AC ELECTRICAL CHARACTERISTICS (Over the operating range, unless otherwise specified.) (Figure 12 and Figure 13)
- Figure 13. TIMING DIAGRAM: SPI WRITE DATA TRANSFER
- NOTES:
- REVISION HISTORY
DS1305
3-WIRE INTERFACE
The 3-wire interface mode operates similarly to the SPI mode. However, in 3-wire mode there is one I/O
instead of separate data in and data out signals. The 3-wire interface consists of the I/O (SDI and SDO
pins tied together), CE, and SCLK pins. In 3-wire mode, each byte is shifted in LSB first unlike SPI mode
where each byte is shifted in MSB first.
As is the case with the SPI mode, an address byte is written to the device followed by a single data byte
or multiple data bytes. Figure 9 illustrates a read and write cycle. In 3-wire mode, data is input on the
rising edge of SCLK and output on the falling edge of SCLK.
Figure 9. 3-WIRE SINGLE-BYTE TRANSFER
NOTE: IN BURST MODE, CE IS KEPT HIGH AND ADDITIONAL SCLK CYCLES ARE SENT UNTIL THE END OF THE BURST.
*I/O IS SDI AND SDO TIED TOGETHER.
A0 A1 A2 A3 A4 A5 A6 1
CE
SCLK
I/O*
D0 D1 D2 D3 D4 D5 D6 D7
SINGLE-BYTE WRITE
D0 D1 D2 D3 D4 D5 D6 D7
A0 A1 A2 A3 A4 A5 A6 0
I/O*
CE
SCLK
SINGLE-BYTE READ
SERMODE = GND
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