CST4040A General Descriptions:
CST4040A series are 4-bits micro-controller which could play 1 channel melody or 1 channel ADPCM with PWM direct drive circuit. PWM resolution is 8/10/12 bits. They include a low cost, high performance CMOS micro-processor. The clock frequency of this up is typically 4.096 (±3%) MHz. This chip operates over a wide voltage range of 1.5V~5.5V. It contains program ROM (PROM) and data ROM (DROM) inside.
The program ROM is 4K/8K words and data ROM size is120K/112K bytes. The maximum working SRAM is (64+2) nibbles. It is provided with total 4 software programmable I/O Ports.
CST4040A Features:
*Operating voltage: 1.5V to 5.5V
*MCU Operation frequency: 2.048/4.096 MHz
*Memory Size
-Program ROM size: 4K/8K*12-bits OTP type
-Data ROM size: 120K/112K bytes OTP type
-SRAM size: 96*4 bits
-User register: 2*4 bits
*Wakeup function for power-down mode:
-HALT mode wakeup source: Port A can wake up from HALT mode to NORMAL mode and executing wakeup sub-routine program.
*4 input/output pins: Port A can be defined as input or output port bit by bit.
*Three reset condition:
-Low voltage reset. (LVR = 1.45V)
-Power on reset.
-Watch dog timer overflow.
*One internal interrupt sources:
-PWM interrupt.
*WDT
-Watch dog timer, can enabled/disabled by option.
-WDT period is 256*256*16/Fsys. (WDT period is 0.13 sec for system clock=2.048MHz)
*Audio output:
-Support PWM mode.
-Support 8/10/12 bits.
*Support option set for pull down resistor 1M, 50K Ohm, low voltage reset…etc.
*Oscillator fuse option ±3%, temperature & voltage compensation.
*Support security option (1 bit) for read inhibition.
*Support 16-levels LVD function.
CST4040A Package：
CST4040A provides SOP8
CST4040A Block Diagram：
CST4040A The Application Circuit：
Notice: C1 : 10 uF ~ 100 uF(depends on applications), C2：0.1 uF
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