ADLINK Technology cPCI-3920 Series User Manual download pdf (Page 34)

20 Functional Description

3.4.6 Watchdog Timer

The AMC-1000 provides a Watchdog Timer that is programmable

for a timeout period ranging from 1 µs to 1 sec, or from 1 ms to

1050 seconds. Failure to trigger the Watchdog Timer in time

results in a system reset, an interrupt, or NMI. In the dual-stage

mode, a combination of both NMI, and reset if the Watchdog is not

serviced. A hardware status flag will be provided to determine if

the Watchdog Timer generated the reset (see Chapter 7 “Watch-

dog Timer” on page 39.

3.4.7 Battery

The AMC-1000 is provided with a 3.0 V “coin cell” lithium battery

for the RTC. To replace the battery, proceed as follows:

X Turn off power

X Remove the battery

X Place the new battery in the socket

X Make sure that you insert the battery correctly. The positive

pole must be on the top.

The lithium battery must be replaced with an identical battery

or a battery type recommended by the manufacturer. Suitable

batteries include the VARTA CR2025 and PANASONIC BR2020.

NOTE:

The user must be aware that the battery’s operational tempera-

ture range is less than that of the AMC-1000’s storage temper-

ature range. For detailed information, refer to the battery

manufacturer’s specifications.

NOTE:

Care must be taken to ensure that the battery is correctly

replaced.The battery should be replaced only with an identi-

cal or equivalent type recommended by the manufacturer. Dis-

pose of used batteries according to the manufacturer’s

instructions.The typical life expectancy of a 225 mAh battery

(VARTA CR2032) is 4-5 years with an average on-time of 8 hours

per working day at an operating temperature of 30°C. However,

this typical value varies considerably because the life expectancy

is dependent on the operating temperature and the standby time

(shutdown time) of the system in which it operates.To ensure that

the lifetime of the battery has not been exceeded, it is recom-

mended to change the battery after 3-4 years.

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ADLINK Technology cPCI-3920 Series User Manual Page 34