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RV-3049 Datasheet(PDF) 51 Page - MICORO CRYSTAL SWITZERLAND

Part # RV-3049
Description  DTCXO Temperature Compensated Real Time Clock
PDF  65 Pages
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Manufacturer  MICROCRYSTAL [MICORO CRYSTAL SWITZERLAND]
Direct Link  http://www.microcrystal.com
Logo MICROCRYSTAL - MICORO CRYSTAL SWITZERLAND

RV-3049 Datasheet(HTML) 51 Page - MICORO CRYSTAL SWITZERLAND

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Micro Crystal
DTCXO Temperature Compensated Real Time Clock / Calendar Module
RV-3049
51/65
Serial bus write example (Seconds register set to 45 seconds, Minutes register set to 10 minutes)
b7
0
R / W
Page Address
Seconds data 45BCD
SCL
Minutes data 10BCD
b6
0
b5
0
b4
0
b3
1
b1
0
b0
0
b7
0
B6
1
b5
0
b3
0
b2
1
b1
0
b0
1
b7
0
b5
0
b4
1
b3
0
b2
0
b1
0
SDO
address
counter
b2
0
b4
0
b6
0
b0
0
0Ah
09h
08h
XX
SDI
CE
Register Address
Command Byte
08 Hex
Write
1
2
3
3
4
High Z
High Z
Data Byte
Data Byte
1
CE goes “High”:
transmission starts. SPI interface of the RV-3049 is enabled.
2
After sending Command Byte: the command byte sets the RV-3049 in “Write Mode”, the SDO pin
remains in High-Z mode. The Page & Register address are set to 08h
(Clock page; Seconds register).
3
After writing Data Byte:
after writing of every data byte, the register address is automatically
incremented.
4
CE goes “Low”:
transmission stops. SPI Interface of the RV-3049 is disabled, SDO
remains High-Z.
Note:
In this example, the Seconds and Minutes registers are written. Pins SDI and SDO are not connected together,
since the device is accessed in write mode the SDO line remains High-Z during the whole transmission.



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