Real time clock module
Product Number (Please contact us)
RX-4045SA AA : Q41404552000100
RX-4045SA AC : Q41404551000200
RX-4045NB AA: Q41404592000100
RX-4045NB AC: Q41404592000200
REAL TIME CLOCK MODULE (SPI-Bus)
High-Stability Frequency
RX-4045SA/NB
•Built-in 32.768 kHz crystal unit: Frequency adjusted for high accuracy.
6
(510 /Ta=+25C)
•Interface Type
: 4-wire serial interface
: 1.7Vto5.5V
•Operating voltage range
•Wide Timekeeper voltage range
•Various detection Functions
•Low backup current
•32.768 kHz clock frequency output : N-ch open drain output
•Function of time and calendar, the various detection function,
and interrupt function etc.
: 1.15Vto5.5V
: Oscillation stop detection function etc.
: 0.48A/3V(Typ.)
Actual size
RX-4045SA
RX-4045NB
Block diagram
Overview
• Features built-in 32.768kHz crystal unit
▪Frequency adjusted forhigh accuracy
(510 /Ta=+25C)
(Equivalent to 13 seconds of monthly deviation)
ALARM_W REGISTER
(MIN,HOUR, WEEK)
FOUT
32kHz
OUTPUT
CONTROL
COMPARATOR_W
COMPARATOR_D
6
VDD
VOLTAGE
DETECT
ALARM_D REGISTER
(MIN,HOUR)
• The various detection Function
▪Power supply voltage monitoring function
(with selectable detection threshold)
▪Stop detection function
DIVIDER
TIME COUNTER
CORREC
-TION
DIV
OSC
(SEC,MIN,HOUR,WEEK,DAY,MONTH,YEAR)
GND
CLK
▪Power-on reset detection function
ADDRESS
ADDRESS
OSC
DETECT
•Equipped with alarm and timer
I/O
CONTROL
REGISTER
DECODER
DI
▪Timer function produces a periodic interruption signal.
As for the Alarm function an optional combination is
produced. (Date of the week , time , minute)
DO
/INT
CE
INTERRUPT CONTROL
SHIFT REGISTER
Pin function
Terminal connection/External dimensions
(Unit:mm)
Signal
Name
Input /
Output
RX4045SA
RX4045NB
Function
N.C.
N.C.
1. CE
22.
21.
The chip enabled input pin.
( built -in pull-down resistance )
At the "H"level, access becomes possible.
1. N.C.
2. CLK
3. FOUT
4. N.C.
5. TEST
6. VDD
7. CE
14. N.C.
13. DO
12. DI
CE
Input
2. VDD
3. (GND)
4. TEST
5. FOUT
6. CLK
7. DO
20. N.C.
CLK
DI
Input
Input
The shift clock input pin for serial data transfer.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
19.
18.
17.
16.
15.
14.
13.
12.
The data input pin for serial data transfer.
The data output pin for serial data transfer.
11. GND
DO
Output
5.0
4.8
32.768kHzclock output pin with the output control
function (N-ch open drain)
High impedance at the time of output off.
10.
/INT
FOUT Output
8. DI
1.30.1
9. N.C.
8. N.C.
9. GND
/ INT
Output
Interrupt output (N-ch open drain)
10.
7.40.2
/INT
Used by the manufacturer for testing.
(Do not connect externally.)
5.00.2
TEST
11. N.C.
SOP14 pin
VDD
Connected to a positive power supply.
SON22 pin
GND
Connected to a ground.
The metal case inside of the molding compound may be exposed on the top or bottom of this product.
This purely cosmetic and does not have any effect on quality, reliability or electrical specs.
Specifications (characteristics)
Refer to application manual for details.
Current consumption characteristics
Recommended Operating Conditions
Ta=-40Cto+85C
Symbol
Item
Conditions
Min.
-
Typ.
Max. Unit
Item
Symbol
Conditions
Min.
Typ.
Max.
Unit
Power voltage
Clock voltage
Operating
VDD
VCLK
3.0
3.0
5.5
5.5
V
V
1.7
1.15
VDD
=5V
0.60
0.48
1.80
µA
CE=GND
IBK
FOUT;output OFF
TOPR
-40
+25
+85
C
VDD
=3V
temperature
(Hi-z)
Current
Consumption
-
-
1.20
Frequency characteristics
CE=GND
VDD
=3V
I32k
0.65
2.00
µA
Item
Symbol
Conditions
Rating
Unit
106
s
FOUT;32.768kHz
output ON
Frequency
tolerance
Ta=+25°C
AA: 551)
AC: 052)
f/f
VDD=3.0V
Ta=+25°C
VDD=2.0V
Ta=+25°C
Power supply detection voltage
Ta=-30Cto+70C
Typ. Max. Unit
Oscillation
start-up time
1Max.
tSTA
Item
Symbol
VDETH
VDETL
Conditions
Min.
1.90
1.15
Frequency / voltage
characteristics
f/V
1Max.
106
VDD=2.0Vto5.5V
High-voltage mode
Low-voltage mode
VDD pin
2.10
1.30
2.30
1.45
V
V
1)2) Equivalent to ±13 seconds of monthly deviation (excluding offset.)
VDD pin
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