9. RTC Option Module
The following provides details on the Armadillo-400 Series RTC Option Module hardware.
9.1. Board Overview
The RTC Option Module is a board that connects to Expansion Interface 2 (CON14)
[1]
on the Armadillo-400 Series. The
board incorporates a Seiko Instruments Inc. real-time clock. An electric double-layer capacitor provides backup power to
the real-time clock allowing it to function for a period of time even after power to the board has been cut. It is possible to
connect a separate external battery in order to maintain time data during extended periods of no power supply.
The RTC Option Module is included in the Armadillo-420 Basic Model Development Set and is also available for sale
separately.
The main specifications of the RTC Option Module are as follows.
9.1 RTC Option Module Specifications
Calendar Clock
S-35390A (Seiko Instruments Inc.)
[1]
Backup
EECEN0F204RK (Panasonic) mounted
[2]
,
additional battery can be connected to External Backup Connector (CON2)
Board Size
10.0 x 22.0 mm
Power Supply Voltage
DC3.3V
Operating Temperature
-10 - 60製 (with no condensation)
[1]
The time accuracy is approximately ±30 seconds per month average at an environment temperature of 25製 (reference value only). As the accuracy is
highly dependent on environmental temperature, please make sure to check all relevant characteristics before use.
[2]
The backup time is approximately five days at an environment temperature of 25製 (reference value only). As backup time is highly dependent on
environmental temperature and length of voltage supply etc, please make sure to check all relevant characteristics before use.
[1]
The CON14 signal can be used for transmission when it is set to I2C2 in i.MX257's multiplex function.
Armadillo-400 Series Hardware Manual
RTC Option Module
45
