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CDCE913 Fiches technique(PDF) 11 Page - Texas Instruments

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No de pièce CDCE913
Description  Programmable 1-PLL VCXO Clock Synthesizer With 1.8-V, 2.5-V, and 3.3-V Outputs
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

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DATA PROTOCOL
COMMAND CODE DEFINITION
Generic Programming Sequence
1
7
1
1
8
1
1
S
Slave Address
A
DataByte
A
P
MSB
LSB
MSB
LSB
S
StartCondition
Sr
RepeatedStartCondition
1=Read(Rd)FromCDCE9xxDevice;0=Write(Wr)toCDCE9xxx
A
Acknowledge(ACK=0andNACK=1)
P
StopCondition
Master-to-Slave Transmission
Slave-to-Master Transmission
R/W
R/W
CDCE913
CDCEL913
SCAS849A – JUNE 2007 – REVISED AUGUST 2007
The device supports Byte Write and Byte Read and Block Write and Block Read operations.
For Byte Write/Read operations, the system controller can individually access addressed bytes.
For Block Write/Read operations, the bytes are accessed in sequential order from lowest to highest byte (with
most significant bit first) with the ability to stop after any complete byte has been transferred. The numbers of
Bytes read-out are defined by Byte Count in the Generic Configuration Register. At Block Read instruction, all
bytes defined in the Byte Count must be readout to correctly finish the read cycle.
Once a byte has been sent, it is written into the internal register and is effective immediately. This applies to
each transferred byte regardless of whether this is a Byte Write or a Block Write sequence.
If the EEPROM Write Cycle is initiated, the internal SDA registers are written into the EEPROM. During this Write
Cycle, data is not accepted at the SDA/SCL bus until the write cycle is completed. However, data can be read
out during the programming sequence (Byte Read or Block Read). The programming status can be monitored by
EEPIP, byte 01h–bit 6.
The offset of the indexed byte is encoded in the command code, as described in Table 5.
Table 5. Slave Receiver Address (7 Bits)
DEVICE
A6
A5
A4
A3
A2
A1(1)
A0(1)
R/W
CDCE913/CDCEL913
1
1
0
0
1
0
1
1/0
CDCE925/CDCEL925
1
1
0
0
1
0
0
1/0
CDCE937/CDCEL937
1
1
0
1
1
0
1
1/0
CDCE949/CDCEL949
1
1
0
1
1
0
0
1/0
(1)
Address bits A0 and A1 are programmable via the SDA/SCL bus (byte 01, bit [1:0]. This allows addressing up to 4 devices connected to
the same SDA/SCL bus. The least-significant bit of the address byte designates a write or read operation.
Table 6. Command Code Definition
BIT
DESCRIPTION
0 = Block Read or Block Write operation
7
1 = Byte Read or Byte Write operation
(6:0)
Byte Offset for Byte Read, Block Read, Byte Write and Block Write operation.
Figure 7. Generic Programming Sequence
Copyright © 2007, Texas Instruments Incorporated
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Product Folder Link(s): CDCE913 CDCEL913


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