Rainbow Electronics ISD18B12 - Manual (Page 9)

ISD18B12
Publication Release Date: August 31, 2007
- 9 - Revision A1
5.13. TryMe Special Operation :
This is a special feature. When TryMe is High, TryMe is active. When TryMe is Low, TryMe is disabled.
The enabling and disabling of this feature is merely permitted while the device is in power down status. Once
TryMe is set, trigger on either RECL or RECE will initiate the TryMe operation sequence. While active, the
device performs a combination of the following 3 operations sequentially: Record a new message and
automatic playback the just-recorded message once, then delete the recorded message. Internal pull-up
exists.
The details of each operation are described as follows:
a) Recording:
• The recording behavior follows the characteristics of the selected record pin, RECL or RECE .
• While recording, the LEDR is on if an LED is connected appropriately.
b) Playback:
• Upon completion of recording, the device automatic plays the just-recorded message once and
stops. During this operation, change of state on any control pins is prohibited.
• While playback, the LEDP is on if an LED is connected appropriately.
c) Erasure:
• Upon completion of playback, the device will involuntary delete the recorded message. During this
operation, change of state on any control pins is banned.
After completion of this TryMe operation, the device returns to standby state automatically. Once playback
operation starts, any input on other controls is illegal.
As a summary, the TryMe mode starts in the following conditions:
Pin
TryMe RECL RECE
Logic Level 1 0 1
1 1 0
Under no circumstances, while this special operation is in progress, neither the power is disturbed
nor any change of state on other control pins are permitted. Otherwise, it may cause the device
becoming malfunction.
Fig 6: TryMe function via ( TryMe + RECL )