rtc-4553ac Epson Electronics America, Inc., rtc-4553ac Datasheet - Page 5

• Manufacturer Part Number: rtc-4553ac
• Description: Real Time Clock Module
• Manufacturer: Epson Electronics America, Inc.

RTC – 4553AC
3. Terminal description
3.1. Terminal connections
3.2. Terminal functions
Note1 At initial power-on or voltage restoration from an intermediate potential outside of the range where operation is
Note2 Be sure to connect a bypass capacitor of 0.1 F or more directly between V
Signal designation
( WRITE enable )
( Chip select 0 )
( Chip select 1 )
( Serial output )
( Serial clock )
( Serial input )
( Timing pulse
TP
output )
L4 , L5
L1 L3
assured (0.3 V to 1.9 V), the power-on reset circuit may not operate normally, leading to possible malfunction.
(See section " 8.3.9. Power-On Reset ".)
S
GND
SCK
CS0
CS1
V
WR
S
OUT
OUT
DD
IN
Pin No.
9, 10
5 7
1.
2.
3.
4.
5.
6.
7.
11
12
13
14
1
2
3
4
8
GND
S
L
L
L
WR
SCK
1
2
3
IN
/ Output
Input
—
—
—
O
O
I
I
I
I
I
Power supply negative pin. Connect to ground.
Address and data are written at WR = "L". Counter data (second digit to
year digit) are written using the incrementing method.
Data at the specified address are read at WR = "H". While the address is
being set at S
Serial address and data I/O pin. Serves for address and control register
writing for the various counters, and for RAM address and data writing.
Serial I/O sync signal input pin. Input a sync signal to this pin to allow address
and data read/write synchronized to this signal.
One cycle comprises 8 clocks (4 address clocks + 4 data clocks)
Test pins reserved for use by Epson. Be sure to leave these pins
unconnected.
Power supply pin. Connect to a power source. For normal operation and bus
access, supply 5 V ±10% or 3 V ±10%. For backup battery operation, provide
a voltage of 2 V or higher.
See Note 1.
This pin serves to select the RTC. While CS0 is "L", the microprocessor
can perform register access. While
high-impedance state.
Connect this pin to the power down detection circuit. If no power down
detection circuit is used, fix the pin at "H" (V
Serial address and data output pin. Serves for address and control register
readout of the various counters, and for RAM address and data readout.
Output pin for 1024 Hz or 1/10 Hz timing pulse, based on internal reference
clock. For clock accuracy checking, use 1/10 Hz.
For 1024 Hz, the duty cycle changes once every 10 seconds.
TP
OUT
# 1
# 7
are in the high-impedance state, regardless of CS0 .
RTC - 4553
SOP - 14 pin
Page - 2
IN
, the data at S
#14
# 8
OUT
are for the previously specified address.
Function
DD
14.
13.
12.
11.
10.
9.
8.
and GND.
CS0
S
CS
L
L
V
DD
TPOUT
CS0
5
4
OUT
DD
1
). When CS1 is "L", S
is "H", S
OUT
MQ - 342 - 01
is in the
OUT
and