第9章 RTC Option Module

第9章 RTC Option Module

9.1. Board Overview
9.2. Interface Layout
9.3. Board Outline Diagrams
9.4. RTC Module Assembly

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)^[9] 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.

表9.1 RTC Option Module Specifications

Calendar Clock	S-35390A (Seiko Instruments Inc.) ^[a]
Backup	EECEN0F204RK (Panasonic) mounted^[b], 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℃ (with no condensation)
^[a]The time accuracy is approximately ±30 seconds per month average at an environment temperature of 25℃ (reference value only). As the accuracy is highly dependent on environmental temperature, please make sure to check all relevant characteristics before use. ^[b]The backup time is approximately five days at an environment temperature of 25℃ (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.

9.2. Interface Layout

図9.1 RTC Option Module Interface Layout

表9.2 RTC Option Module Interface Details

Part Number

Interface

Shape

Notes

CON1

Armadillo-400 Series

Connector

4 pin (2.54 mm pitch)

CON2

External Backup Connector^[a]

DF13-2P-1.25DSA

(Hirose Electric Co.)

Supported battery: CR2032WK11

(Hitachi Maxell or similar)

^[a]For the circuit layout of the External Backup Connector (CON2), please refer to the "Armadillo-400 RTC Option Module Circuit Diagram" stored in the /document/hardware directory on the included DVD.