SNC26041

One Channel Speech Controller

Ver: 1.7

October 14, 2009

7

5.7 PWM Output

Two huge output stage circuits are designed in SNC26041. With this advanced

circuit, the chip is capable of driving speaker directly without external transistors.

BUO1

BUO2

PWM Output

5.8 Watch Dog Timer

SNC26041 built an internal WDT (Watch Dog Timer). This Watchdog timer would

issue resets signal to this chip if it is not cleared before reaching terminal count (128

ms). The watchdog timer is enabled at reset and cannot be disabled.

5.9 IR Function

P23 can be modulated with 38.5KHz square wave before sent out to P23 pin.

The IR signal can be achieved by this modulated signal.

5.10

PWM IO control

SNC26041 has support 4 PWM IO (P20~P23). Each I/O has 8 bit independent duty

register, and the 8 bit register are compare with 8 bits counter. If set use PWM IO

function and internal counter start at 000H, the mapping I/O will set High. The 8 bits

counter increment if the same duty register, that will reset the mapping IO pin.

6. ABSOLUTE MAXIMUM RATING

Items

Symbol

Min

Max

Unit.

Supply Voltage

-0.3

6.0

V

Input Voltage

V

Operating Temperature

0

55.0

Storage Temperature

-55.0

125.0