Datasheet
Actual size
Real time clock module
Real time clock moduleReal time clock module
Real time clock module
Block diagram
Overview
CLK
/SCL
DI
/SDA
V
IO
CE
/FOE
SPISEL
DO
/IRQ1
/IRQ2
V
DD
V
BAT
L
VEL SHIFTER
I
/
O
Control
VDD
Detector
GND
Bus
Interface
Register
Control
(System
Control)
Divider
Clock
and
Calender
Timer
Register
Interrupts
Controller
User RAM
Alarm
Register
FOUT Controller
OSC
R
C
secondary
battery
EDLC
or
V
BAT
primary
battery
R
C
Battery backup connection example (1)
V
BAT
Battery backup connection example (2)
•Interface type.
•SPI-Bus and I
2
C-Bus interface.
•By a terminal, a switchover of the interface is possible.
•Built-in auto power switching function
•To efficiently charge from VDD to backup battery (Secondary
battery, Large capacitor) connected to VBAT is possible.
Detects VDD voltage drop(VDET-) and automatically switches to
the backup battery.
•Frequency output function
Output frequency is selectable from 32.768kHz, 1024Hz,1Hz.
•Timer function
•Timer function is selectable in 1/4096 second from 65535 hours.
•Timer source clock are 1hour, 1min, 64Hz, 4096Hz.
•It is recorded automatic to TF-bit at the time of event occurrence,
and possible to output with /IRQ1 or /IRQ2 pin.
•Alarm function
•Alarm function can be set to day of week,
day, hour, and minute.
•It is recorded automatic to AF-bit at the alarm occurrence,
and possible to output with /IRQ1 pin output.
•User RAM
•128 bit (8 bit x 16, SRAM)
Pin Function
Terminal connection
/
External dimensions
(Unit:mm)
Signal Name
Input/Output
Function
SPISEL Input
The interface select pin.
SPI is chosen at a "H" level (V
IO
voltage) / I
2
C is chosen at a "L" level (GND voltage).
CE/FOE Input
SPI: Should be held high to allow access to the CPU.
Incorporates a pull-down resistor.
I
2
C: It is an input pin for controlling the DO/FOUT output. When the frequency output from a
DO/FOUT pin does not need, CE/FOE pin must be connected to GND.
CLK/SCL Input
This is a shift clock input pin for serial data transmission.
DI/SDA Input / Output
SPI: This is the data input pin for serial data transfer.
I
2
C: This is the data input/output pin for serial data transfer.
DO/FOUT Output
SPI: This is the data output pin for serial data transfer.
I
2
C: This is the C-MOS output pin with output control provided via the CE/FOE pin.
(frequency selection: 32.768 kHz / 1024 Hz / 1Hz / Hi-z)
/ IRQ1 Output
This pin outputs interrupt signals ("L" level) for alarm, timer, time update, and FOUT.
This is an N-ch open-drain output. This pin can output even a backup mode.
/ IRQ2 Output
This pin outputs interrupt signals ("L" level) for timer and FOUT.
This is an C-MOS output. This pin becomes Hi-z in less than V
DD
=1.6V.
V
DD
−
This is a power-supply pin. It can impress the voltage unlike V
IO
.
V
IO
−
This pin is a power supply for input and the output and input / output pins.
Connected to a positive power supply.
V
BAT
−
Connect a secondary battery or capacitor for backup power supply.
If a backup power supply is not present, this pin connect to V
DD
GND
−
Connected to a ground.
RX 6110 SA
1.
CLK/SCL
10.1
± 0.2
5.0
7.4
±
0.2
3.2
±
0.1
1.27
14
.
N.C.
2.
DI/SDA
13
.
N.C.
3.
DO/FOUT
12
.
/IRQ1
4.
CE/FOE
11
.
VIO
5.
SPISEL
10
.
VDD
6.
GND 9.
VBAT
7.
/IRQ2 8.
N.C.
SOP - 14 pin
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.
Recommended Operating Conditions
Item Symbol
Conditions Min. Typ. Max.
Unit
Power voltage
V
DD
-
1.6
3.0
5.5
V
Clock voltage V
CLK
-
1.1 3.0 5.5 V
Operating
temperature
T
OPR
-
-40 +25 +85
°C
Frequency characteristics
Item Symbol
Conditions Rating Unit
Frequency
tolerance
∆ f / f
T
a
= +25 °C
V
DD
= 3.0 V
B: 5 ± 23
∗1
× 10
−
6
Oscillation
start-up time
t
STA
T
a
=
+25
°
C
V
DD
= 1.6 V
1 Max.
s
∗1) Equivalent to 1 minute of monthly deviation (excluding offset.) / Standard product
Current consumption characteristics
T
a
= -40 °C to +85 °C
Item Symbol
Conditions Min.
Typ.
Max.
Unit
Current
Consumption
IBK
V
BAT
= 3.0 V
Input pins are "L" ,V
DD
= 0 V
DO/FOUT=OFF, fCLK = 0 Hz,
/IRQ1,2 = OFF, TSEL2=”1”
It include an OFF leak current of
SW between the power supply
(V
BAT
-V
DD
)
- 130
250
nA
I32k
V
DD
= 3.0 V
f
CLK
= 0 Hz,
/IRQ1,2 = OFF, CE/FOE = VIO,
DO/FOUT : 32.768 kHz ON ,
CL = 0 pF
-
1.5
2.1
µA
REAL TIME CLOCK MODULE (SPI &
I
2
C-Bus
)
Power Switching
and Low current consumption
RX6110
SA B
•Built in frequency adjusted 32.768 kHz crystal unit.
•Interface Type : SPI & I
2
C -Bus
•Operating voltage range : 1.6 V to 5.5 V
•The wide voltage for time keeping. : 1.1 V to 5.5 V
•Low backup current : 130 nA / 3 V ( Typ. )
•Built-in user RAM :
128
bit
(
8
bit
×
16,
SRAM)
•Auto power switching functions : When VDD deteriorates
than 1.6V, internal source
is switched to VBAT.
•The various functions include full calendar, alarm, timer.
Epson prepared Linux driver for development.
(http://www5.epsondevice.com/en/information/support/linux_rtc/)
The registered trademark Linux® is used pursuant to a sublicense from LMI(Linux Mark Institute)
The I
2
C-Bus is a trademark of NXP Semiconductors
Product Number (Please contact us)
RX6110SA B : X1B000232000100