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鍙冩暩(sh霉)璩囨枡
鍨嬭櫉(h脿o)锛� DS1307Z/T&R
寤犲晢锛� Maxim Integrated Products
鏂囦欢闋佹暩(sh霉)锛� 4/14闋�
鏂囦欢澶у皬锛� 0K
鎻忚堪锛� IC RTC SERIAL 512K 8-SOIC
鐢�(ch菐n)鍝佸煿瑷�(x霉n)妯″锛� Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
妯�(bi膩o)婧�(zh菙n)鍖呰锛� 2,500
椤炲瀷锛� 鏅�(sh铆)閻�/鏃ユ
鐗归粸(di菐n)锛� 闁忓勾锛孨VSRAM锛屾柟娉㈣几鍑�
瀛樺劜(ch菙)瀹归噺锛� 56B
鏅�(sh铆)闁撴牸寮忥細 HH:MM:SS锛�12/24 灏忔檪(sh铆)锛�
鏁�(sh霉)鎿�(j霉)鏍煎紡锛� YY-MM-DD-dd
鎺ュ彛锛� I²C锛�2 绶氫覆鍙�
闆绘簮闆诲锛� 4.5 V ~ 5.5 V
闆诲 - 闆绘簮锛岄浕姹狅細 2 V ~ 3.5 V
宸ヤ綔婧害锛� 0°C ~ 70°C
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灏佽/澶栨锛� 8-SOIC锛�0.154"锛�3.90mm 瀵級
渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁濓細 8-SOIC
鍖呰锛� 甯跺嵎 (TR)
DS1307 64 x 8, Serial, I2C Real-Time Clock
12 of 14
...
A
XXXXXXXX
A
1101000
S
0
XXXXXXXX A XXXXXXXX A
XXXXXXXX A P
<Slave Address>
<Word Address (n)>
<Data(n)>
<Data(n+1)>
<Data(n+X)>
S - Start
A - Acknowledge (ACK)
P - Stop
<R
W
>
DATA TRANSFERRED
(X+1 BYTES + ACKNOWLEDGE)
Master to slave
Slave to master
A
XXXXXXXX
A
1101000
S
1
XXXXXXXX A XXXXXXXX
XXXXXXXX A P
<Slave Address>
<Data(n)>
<Data(n+1)>
<Data(n+2)>
<Data(n+X)>
S - Start
A - Acknowledge (ACK)
P - Stop
A
- Not Acknowledge (NACK)
<R
W
>
DATA TRANSFERRED
(X+1 BYTES + ACKNOWLEDGE); NOTE: LAST DATA BYTE IS
FOLLOWED BY A NOT ACKNOWLEDGE (A) SIGNAL)
Master to slave
Slave to master
...
A
The DS1307 can operate in the following two modes:
1.
Slave Receiver Mode (Write Mode): Serial data and clock are received through SDA and SCL. After
each byte is received an acknowledge bit is transmitted. START and STOP conditions are recognized
as the beginning and end of a serial transfer. Hardware performs address recognition after reception of
the slave address and direction bit (see Figure 4). The slave address byte is the first byte received
after the master generates the START condition. The slave address byte contains the 7-bit DS1307
address, which is 1101000, followed by the direction bit (R/
W), which for a write is 0. After receiving and
decoding the slave address byte, the DS1307 outputs an acknowledge on SDA. After the DS1307
acknowledges the slave address + write bit, the master transmits a word address to the DS1307. This
sets the register pointer on the DS1307, with the DS1307 acknowledging the transfer. The master can
then transmit zero or more bytes of data with the DS1307 acknowledging each byte received. The
register pointer automatically increments after each data byte are written. The master will generate a
STOP condition to terminate the data write.
2.
Slave Transmitter Mode (Read Mode): The first byte is received and handled as in the slave receiver
mode. However, in this mode, the direction bit will indicate that the transfer direction is reversed. The
DS1307 transmits serial data on SDA while the serial clock is input on SCL. START and STOP
conditions are recognized as the beginning and end of a serial transfer (see Figure 5). The slave
address byte is the first byte received after the START condition is generated by the master. The slave
address byte contains the 7-bit DS1307 address, which is 1101000, followed by the direction bit (R/
W),
which is 1 for a read. After receiving and decoding the slave address the DS1307 outputs an
acknowledge on SDA. The DS1307 then begins to transmit data starting with the register address
pointed to by the register pointer. If the register pointer is not written to before the initiation of a read
mode the first address that is read is the last one stored in the register pointer. The register pointer
automatically increments after each byte are read. The DS1307 must receive a Not Acknowledge to
end a read.
Figure 4. Data Write鈥擲lave Receiver Mode
Figure 5. Data Read鈥擲lave Transmitter Mode
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