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SI4701 датащи(PDF) 9 Page - Silicon Laboratories

номер детали SI4701
подробное описание детали  Device initialization sequence and busmode selection
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производитель  SILABS [Silicon Laboratories]
домашняя страница  http://www.silabs.com
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AN230
Rev. 0.9
9
2.3. 2-Wire Control Interface
For two-wire operation, a transfer begins with the START condition. A START condition is defined as a high to low
transition on the SDIO pin while SCLK is high. Transitions for data bits must occur while the SCLK pin is low. The
byte following the START is the control word. The control word is latched internally on rising SCLK edges and is
eight bits in length, comprised of a seven bit device address equal to 0010000b and a read/write bit (read = 1 and
write = 0). The ordering of the control word is A6:A0, R/W as shown below. The device remains in the read or write
state until the STOP condition is received.
For write operations, the control word and device acknowledge is followed by an eight bit data word latched
internally on rising edges of SCLK. The device always acknowledges the data by setting SDIO low on the next
falling SCLK edge. Any number of data bytes may be written by repeating the write process without sending a
STOP condition. Device register addresses are incremented by an internal address counter, starting with the upper
byte of register 02h, followed by the lower byte of register 02h, and wrapping back to 00h at the end of the register
file. The transfer is considered finished upon receipt of a STOP condition.
Figure 6. 2-Wire Control Interface Write Timing Diagram
For read operations, the control word and device acknowledge is followed by an eight bit data word shifted out on
falling SCLK edges. Any number of data bytes can be read by sending a low ACK to the device. Device register
addresses are incremented by an internal address counter, starting at the upper byte of register 0Ah, followed by
the lower byte of register 0Ah, and wrapping back to 00h at the end of the register file. The transfer ends with the
STOP conditions regardless of the state of the acknowledge.
Refer to “2-Wire Control Interface Characteristics” and “2-Wire Control Interface Read and Write Timing
Parameters” of the device data sheet.
Figure 7. 2-Wire Control Interface Read Timing Diagram
STOP
A1
A0
W
ACK
D7-D0
D7-D0
A2
A3
A4
A5
A6
Address + W = 00100000
DATA
SCLK
SDIO
ACK
START
ACK
DATA
ACK
ACK
ACK
STOP
A1
A0
ACK
D7-D0
D7-D0
A2
A3
A4
A5
A6
Address + R = 00100001
DATA
SCLK
SDIO
ACK
START
ACK
DATA
ACK
ACK
ACK
R


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