6

SMS44

2047 2.3 10/23/00

SUMMIT MICROELECTRONICS, Inc.

A1, A2

A1 and A2 are the address inputs. When addressing the

SMS44 memory or configuration registers the address

inputs distinguish which one of four possible devices

sharing the common bus is being addressed.

SDA

SDA is the serial data input/output pin. It should be tied to

SCL

through a pull-up resistor.

Figure 4. Watchdog, Longdog and WLDI Timing

IRQ#

RESET#

WLDI

t0

t0

t0

tPRTO

tPLDTO

2047 Fig04 1.0

Figure 3. Watchdog, Longdog and WLDI Timing

IRQ#

RESET#

tPLDTO

WLDI

t0

t0

t0

t0

t0

tPRTO

tPWDTO

tPLDTO

2047 Fig03 1.0