SC3010

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:2.2

2005.12.15

Http: www.silan.com.cn

Page 6 of 15

3). During Matrix Scanning

a). A key is released while one of the drivers outputs is in the low ohmic state (Logic 0)

b). A key is released before that key has been detected.

c). There is no wired connection in the C-KO Matrix when SMS is in High State.

7. OSCILLATOR

The OSC is a 1-pin oscillator input/output terminal. The oscillator is constructed by connecting in series a

ceramic resonator like TOKO CRK429.

8. TEST MODE

When T1, T2 and OSC Pins are in HIGH State, the circuit initializes. All internal nodes except for the LATCH

are defined. The latch is defined when a scan cycle starts by pulling down a KI or a C Input while the oscillator is

active.

If the debounce cycle has been completed, then the scan cycle can be accomplished 3x2

setting the T1 to HIGH. If the scan cycle has been completed, the Latch contents can be read 3x2

by setting the T2 to HIGH.