Real time clock module
• Interface type : 3 wire / 4 wire SPI-Bus
• High stability
XS : ±3.0 x 10
-6
/ -40 ºC to +85 ºC (Monthly rate: ±8 seconds)
: ±5.0 x 10
-6
/ +85 ºC to +105 ºC (Monthly rate: ±13.2 seconds)
XB : ±5.0 x 10
-6
/ -40 ºC to +85 ºC (Monthly rate: ±13.2 seconds)
: ±8.0 x 10
-6
/ +85 ºC to +105 ºC (Monthly rate: ±21 seconds)
• Time stamp function
Trigger source:
External event (EVIN) input, voltage drop/oscillation
stop status detected, command input from the host
Record data:
1/1024 seconds to 1 second, seconds, minutes, hours,
days, months, years
Number of recordable events:
Maximum 32 events
• Backup power supply switching function
The V
DD and VBAT voltages are monitored to switch between Normal
mode (V
DD operation) and Backup mode (VBAT operation).
• Clock output (FOUT)
Selectable from 32.768 kHz, 1024 Hz and 1 Hz outputs
Output can be controlled by a register or FOE input (selectable
with a register).
Terminal connection / External dimensions (Unit: mm)
Specifications (characteristics)
∗ Refer to application manual for details
Recommended Operating Conditions
Frequency Characteristics
Ta = +25 °C,
VDD = 1.6 V ∼ 5.5 V
V
BAT
= 3.0 V,
/INT= Hi-Z, FOUT: Output OFF (Hi-Z),
Temperature compensation interval: 2 s,
FSEL1= FSEL0 = 1, INIEN = 1,
CHGEN = 0
, CE
= L
V
DD
= 3.0 V,
/INT= Hi-Z, F O UT: 32 kHz output, C
L
= 0 pF,
Temperature compensation interval: 2 s,
FSEL1 = FSEL0 = 0, INIEN = 1,
CHGEN = 0, CE = L
Number of time stamps recorded
by EVIN terminal trigge
REAL TIME CLOCK MODULE (SPI-Bus)
Built-in 32.768 kHz-DTCXO, +105°C operating temperature,
Low current consumption, Built-in power supply switching circuit and
Time stamp function up to 32 records
RX4901CE
• Built in frequency adjusted 32.768 kHz crystal unit and DTCXO
• Interface Type : 3 wire / 4 wire SPI-Bus
•Current consumption : 240 nA / 3 V (Typ.)
•Auto power switching function : Automatically switches to backup power supply
by monitoring the V
DD / VBAT voltage
• Time stamp function : Maximum 32 time stamps
• Interrupt output : Wake up every hour or every minute or every second
• Alarm interruption : Day, date, hour, minute, second
• Auto repeat wakeup timer interruption
• Self-monitoring interruption : Crystal oscillation stop, V
BAT
low, V
DD
low
EVIN1,2,3 Input
External event input pins. Detectable even in Backup mode.
Pull-up and pull-down is configurable by the resisters
CE Input
Slave select input pin
A pull-down resistor (Typ. 300 kΩ) is included
Serial data input pin (4 wire)
Serial data Output pin (4 wire)
DIO
Serial data input/output pin (3 wire)
FOUT Output
Frequency output pin (CMOS). 32.768 kHz (default), 1024 Hz or 1 Hz
clock output is selectable. This pin can be switched to the wakeup timer
/INT Output
Interrupt output pin (N-ch. open drain). The wakeup timer, time update,
alarm, and/or event detection interrupt signals can be selected to output
from this pin. When two or more signals are selected, they are NORed
before being output. This pin is effective even in Backup mode.
VOUT -
Internal operating voltage output pin
Connect a 1.0 µF bypass capacitor to this pin.
VBAT -
Connect a backup power supply such as a large-size capacitor,
secondary battery, or primary battery.
The operating power voltage is supplied from this pin to the internal
RX4901CE
( 3.2 × 2.5 mm, t = 1.0 mm Max. )
Product Number (2,000 pcs / Reel)
RX4901CE XS A0
X1B000471000115
RX4901CE XB A0
X1B000471000215
RX4901CE XS B0
X1B000471000315
RX4901CE XB B0
X1B000471000415
RX4901CE XS C0
X1B000471000515
RX4901CE XB C0
X1B000471000615
RX4901CE XS D0
X1B000471000715
RX4901CE XB D0
X1B000471000815