Block Diagram; Pin Descriptions - NAD C715 Service Manual

ISL 1208

Block Diagram

SDA
SCL
X1
X2
V
DD
V
TRIP
V
BAT

Pin Descriptions

PIN
NUMBER SYMBOL
1 X1
2 X2
3 V
BAT
4 GND
5 SDA
6 SCL
7 IRQ/F
OUT
8 V
DD
SDA
BUFFER
2
I C
INTERFACE
SCL
BUFFER
CRYSTAL
OSCILLATOR
POR
SWITCH
INTERNAL
SUPPLY
The X1 pin is the input of an inverting amplifier and is intended to be connected to one pin of an external 32.768kHz
quartz crystal. X1 can also be driven directly from a 32.768kHz source.
The X2 pin is the output of an inverting amplifier and is intended to be connected to one pin of an external 32.768kHz
quartz crystal.
This input provides a backup supply voltage to the device. V
V supply fails. This pin should be tied to ground if not used.
DD
Ground.
Serial Data (SDA) is a bidirectional pin used to transfer serial data into and out of the device. It has an open drain
output and may be wire OR'ed with other open drain or open collector outputs.
The Serial Clock (SCL) input is used to clock all serial data into and out of the device.
Interrupt Output/Frequency Output is a multi-functional pin that can be used as interrupt or frequency output pin. The
function is set via the configuration register.
Power supply.
RTC
CONTROL
LOGIC
RTC
DIVIDER
FREQUENCY
ALARM
OUT
DESCRIPTION
2-11
Seconds
Minutes
Hours
Day of Week
Date
Month
Year
CONTROL
REGISTERS
USER
SRAM
supplies power to the device in the event that the
BAT
IRQ/
F
OUT