GMBHR168 Datasheet, PDF (56/70 Pages) List of Unclassifed Manufacturers – Mini BLOCK Housing 16 opto inputs, 8 Relay outputs

grifo^®
ITALIAN TECHNOLOGY
RTC + SRAM
GMB HR168 can be ordered with an optional Real Time Clock + SRAM module already installed
(option .RTC).
The SRAM module, is provided with 256 bytes and the Real Time Clock which manages time (hours,
minutes, seconds) and date (day, month, year, day of the week).
Option is delivered with on board Lithium battery installed.
RTC section can also generate periodic interrupts whose period can be programmed by the user, so
it can be used to awaken CPU from low consumption working modes.
For software management of serial SRAM+RTC module, please refer to specific documentation or
to demo programs supplied with the card.
The user must realize a serial communication with I²C bus standard protocol, through two ZC1 zoket
signals.
The only necessary information is the electric connection:
DATA line (SDA) -> MM PIN 12 P2.1 (input/output)
CLOCK line (SCL) -> MM PIN 13 P2.0 (output)
Please remark that A0 of this component's slave address is bound to logic 0, so its slave address is
hexadecimal A0H.
Logic state 0 of line corresponds to low level logic state (= 0 V), while logic state 1 correspons to
high level logic state (= 5 V).
We also would want to remark that SDA and SCL lines are connected to a 4.7 KΩ pull-up resistor.
NOTE:
When using a GMB HR168 provided with optional Real Time Clock, it is not possible to install a
grifo^® Mini Module with its own Real Time Clock on board, because they use the same slave address
and would conflict.
Page 48
GMB HR168 Rel. 5.00