SNC26031
One Channel Speech Controller
5.7 PWM Output
An PWM circuit is built-in SNC26031. The maximum resolution of PWM is 8 bits.
Two huge output stage circuits are designed in SNC26031. With this advanced
circuit, the chip is capable of driving speaker directly without external transistors.
BUO1
BUO2
PWM Output
5.8 Watch Dog Timer
SNC26031 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
SNC26031 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
Supply Voltage
Input Voltage
Operating Temperature
Storage Temperature
Symbol
V
DD
-V
V
IN
T
OP
T
STG
Min
-0.3
V
SS
-0.3
0
-55.0
Max
6.0
V
DD
+0.3
55.0
125.0
Unit.
V
V
o
C
o
C
Ver: 1.7
7
October 14, 2009
SONIX [ SONIX TECHNOLOGY COMPANY ]
