Real time clock module
Epson Toyocom
High-Stability Frequency
SERIAL-INTERFACE REAL TIME CLOCK MODULE
RX - 4045 SA / NB
•Built-in 32.768 kHz crystal unit
: Frequency adjusted for high accuracy.
(± 5 ×10−6 / T a = +25 °C)
•Interface Type
: 4-wire serial interface
•Operating voltage range
: 1.7 V to 5.5 V
•Wide Timekeeper voltage range
: 1.15 V to 5.5 V
•Various detection Functions
: Oscillation stop detection function etc.
•Low backup current
: 0.48 µA / 3 V (Typ.)
Actual size
•32.768 kHz clock frequency output : N-ch open drain output
RX-4045SA
•Function of time and calendar, the various detection function,
and interrupt function etc.
RX-4045NB
Block diagram
Overview
• Features built-in 32.768 kHz crystal unit
32kHz
OUTPUT
CONTROL
ALARM_W REGISTER
(MIN,HOUR, WEEK)
COMPARATOR_W
ALARM_D REGISTER
(MIN,HOUR)
COMPARATOR_D
DIVIDER
CORREC
-TION
VOLTAGE
DETECT
TIME COUNTER
(SEC,MIN,HOUR,WEEK,DAY,MONTH,YEAR)
DIV
OSC
DETECT
▪Power supply voltage monitoring function
(with selectable detection threshold )
▪Stop detection function
▪Power-on reset detection function
GND
CLK
ADDRESS
REGISTER
ADDRESS
DECODER
• The various detection Function
I/O
CONTROL
• Equipped with alarm and timer
▪Timer function produces a periodic interruption signal.
DI
DO
INTERRUPT CONTROL
SHIFT REGISTER
Pin function
Terminal connection / External dimensions
Input /
Output
CE
Input
CLK
Input
RX − 4045 SA
Function
The chip enabled input pin.
( built -in pull-down resistance )
At the " H " level, access becomes possible.
The shift clock input pin for serial data transfer.
1.
N.C.
2.
The data input pin for serial data transfer.
3.
FOUT
The data output pin for serial data transfer.
4.
N.C.
5.
TEST
1.
N.C.
CE
2.
CLK
(Unit:mm)
RX − 4045 NB
14.
VDD
(GND)
N.C.
22.
21.
N.C.
20.
FOUT
Output
/ INT
Output
TEST
-
VDD
-
32.768 kHz clock output pin with the output control
function ( N-ch open drain )
High impedance at the time of output off.
Interrupt output ( N-ch open drain )
∗ Used by the manufacturer for testing.
(Do not connect externally.)
Connected to a positive power supply.
GND
-
DO
3.
12.
DI
4.
TEST
19.
N.C.
N.C.
FOUT
18.
N.C.
17.
N.C.
16.
N.C.
15.
N.C.
14.
N.C.
13.
−
12.
−
Connected to a ground.
11.
GND
6.
CLK
10.
/ INT
7.
DO
8.
DI
5.0
3.2 ± 0.1
Input
Output
13.
5.
DI
DO
10.1 ± 0.2
Signal
Name
As for the Alarm function an optional combination is
produced. (Date of the week , time , minute)
CE
1.27
/INT
6.3 Max.
OSC
▪Frequency adjusted for high accuracy
( ± 5 ×10−6 /Ta = +25 °C )
( Equivalent to 13 seconds of monthly deviation )
VDD
0.5
FOUT
VDD
7.
CE
N.C.
9.
N.C.
10.
1.3 ± 0.1
GND
8.
7.4 ± 0.2
9.
/ INT
11.
6.
4.8
N.C.
SOP − 14 pin
5.0 ± 0.2
SON − 22 pin
Metal may be exposed on the top or bottom of this product. This will not affect any quality, reliability or electrical spec.
∗ Refer to application manual for details.
Specifications (characteristics)
! Current consumption characteristics
! Recommended Operating Conditions
Item
Power voltage
Clock voltage
Operating
temperature
Symbol
Condition
Min.
Typ.
Max.
Unit
VDD
VCLK
-
1.7
1.15
3.0
3.0
5.5
5.5
V
V
+85
°C
TOPR
-
-40
+25
Symbol
Frequency
tolerance
∆f/f
Oscillation
start-up time
tSTA
Frequency / voltage
characteristics
f/V
∗1) ∗2)
Condition
Symbol
FOUT ;output OFF
(Hi-z)
Current
Consumption
CE = GND
Condition
Ta = +25°C
VDD = 3.0 V
Ta = +25 °C
VDD = 2.0 V
Ta = +25 °C
VDD = 2.0 V to 5.5 V
Rating
AA: 5 ± 5
AC: 0 ± 5
I32k
Unit
∗1)
∗2)
FOUT ;32.768 kHz
output ON
× 10
Ta = −40 °C to +85 °C
Typ.
Max.
VDD
=5V
CE = GND
IBK
! Frequency characteristics
Item
Item
Min.
0.60
1.80
VDD
=3V
0.48
1.20
VDD
=3V
0.65
2.00
Unit
µA
µA
−6
1 Max.
s
± 1 Max.
× 10−6
! Power supply detection voltage
Item
Ta = −30 °C to +70 °C
Symbol
Condition
Min.
Typ.
Max.
Unit
High-voltage mode
VDETH
VDD pin
1.90
2.10
2.30
V
Low-voltage mode
VDETL
VDD pin
1.15
1.30
1.45
V
Equivalent to 13 seconds of monthly deviation (excluding offset.)
http://www.epsontoyocom.co.jp
