DS1337

13 of 13

START and STOP conditions are recognized as the beginning and end of a serial transfer (Figure 6).

The slave address byte is the first byte received after the master generates a START condition. The

slave address byte contains the 7-bit DS1337 address, which is 1101000, followed by the direction bit

(R/

W), which, for a read, is 1. After receiving and decoding the slave address byte the device outputs

an acknowledge on the SDA line. The DS1337 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 DS1337

must receive a “not acknowledge” to end a read.

Figure 5. Data Write: Slave Receiver Mode

Figure 6. Data Read: Slave Transmitter Mode

CHIP INFORMATION

Transistor Count: 10,950

Process: CMOS

PACKAGE INFORMATION

For the latest package outline information, go to www.maxim-ic.com/dallaspackinfo.