Rainbow Electronics DS1340 - Manual (Page 12)

DS1340
2-Wire RTC with Trickle Charger
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with the DS1340 acknowledging each byte
received. The register pointer increments after
each data byte is transferred. The master gener-
ates a STOP condition to terminate the data write.
Slave Transmitter Mode (Read Mode): The first
byte is received and handled as in the slave
receiver mode. However, in this mode, the direc-
tion bit indicates that the transfer direction is
reversed. The DS1340 transmits serial data on
SDA while the serial clock is input on SCL. START
and STOP conditions are recognized as the begin-
ning and end of a serial transfer. Hardware per-
forms address recognition after reception of the
slave address and direction bit. The slave address
byte is the first byte received after the master gen-
erates the START condition. The slave address
byte contains the 7-bit DS1340 address, which is
1101000, followed by the direction bit (R/W),
which is 1 for a read. After receiving and decoding
the slave address byte, the DS1340 outputs an
acknowledge on SDA. The DS1340 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 DS1340
must receive a not acknowledge to end a read.
Chip Information
TRANSISTOR COUNT: 10,930
PROCESS: CMOS
SUBSTRATE CONNECTED TO GROUND
Thermal Information
Theta-JA: +170°C/W (0.150in SO)
Theta-JC: +40°C/W (0.150in SO)
Theta-JA: +221°C/W (µSOP)
Theta-JC: +39°C/W (µSOP)
Package Information
For the latest package outline information, go to
www.maxim-ic.com/DallasPackInfo.