BU9873 Datasheet, PDF (3/40 Pages) Rohm – I2C BUS Serial Interface RTC with High-precision Oscillation Adjustment

BU9873
Pin Configuration
VDD
8
(TOP VIEW)
OSCIN OSCOUT INTRB
7
6
5
BU9873F
BU9873FJ
BU9873FVT
BU9873FVM
BU9873NUX
:SOP8
:SOP-J8
:TSSOP-B8
:MSOP8
:VSON008X2030
Datasheet
1
2
32KOUT SCL
3
SDA
4
VSS
Figure 3. Pin configuration
Pin Description
Pin No. Symbol Input/Output
Function
The 32KOUT pin is used to output 32.768 kHz clock pulses, which is
1
32KOUT
Output controlled by an internal register. This pin is enabled during power-on
from 0V, and is CMOS push-pull output.
2
SCL
Input
The SCL pin is used to input clock pulses synchronizing the input/output
data from SDA pin.
The SDA pin is used to input and output data for writing and reading,
3
SDA Input/Output which is synchronized with SCL pin. This pin is N-channel open drain
output.
4
VSS
-
The VSS pin is grounded.
The INTRB pin is used to output periodic interrupt, or alarm interrupt
5
INTRB
Output (Alarm_A, Alarm_B) to the CPU. This pin is disabled during power-on
from 0V, and is also N-channel open drain output.
6 OSCOUT
7
OSCIN
-
The OSCIN and OSCOUT pins are used to connect the 32.768 kHz
crystal oscillator (Beside the crystal, all other oscillation circuit
-
components is already integrated in this IC).
8
VDD
-
The VDD pin is connected to the power supply.
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