LC72346W Datasheet | SANYO

Ordering number : ENN- 6651 CMOS IC LC72346W, 72347W Ultralow-Voltage ETR Controller with On-Chip LCD Driver Preliminary Overview The LC72346W and LC72347W are ultralow-voltage electronic tuning microcontrollers that include a PLL that operates up to 250 MHz and a 1/4 duty 1/2 bias LCD driver on chip. This IC includes an on-chip DC-DC converter that can easily create the power supply voltages needed for electronic tuning and contribute to reducing end product costs. This IC is optimal for portable audio equipment that must operate from a single battery. - PLL: Reference frequencies: 1, 3, 3.125, 5, 6.25, 12.5, and 25 k Hz - Input frequencies: FM band: 10 to 250 MHz AM band (high): 2 to 20 MHz AM band (low): 0.5 to 10 MHz - Input sensitivity: FM band: 35 m Vrms (50 m Vrms at 130 MHz or higher frequency) AM band (high, low): 35 m Vrms - External reset input: During CPU and PLL operations, instruction execution is started from location 0. - Built-in power-on reset circuit: The CPU starts execution from location 0 when power is first applied. - Halt mode: The controller-operating clock is stopped. Continued on next page. Function - Program memory (ROM): - 4096 × 16 bits (8K bytes) : LC72346 - 6144 × 16 bits (12K bytes): LC72347 - Data memory (RAM): - 256 × 4 bits: LC72346 - 512 × 4 bits: LC72347 - Cycle time: 40 µs (all 1-word instructions) at 75k Hz crystal oscillation - Stack: 8 levels - LCD driver: 48 to 80 segments (1/4 duty, 1/2 bias drive) - Interrupts: Two external interrupts Timer interrupts (1, 5, 10, and 50 ms) - A/D converter: Four input channels (6-bit successive approximation conversion) - Input ports: 7 ports (of which three can be switched for use as A/D converter inputs) - Output ports: 6 ports (of which 1 can be switched for use as the beep tone output and 2 are open-drain ports) - I/O ports: 20 ports (of which 8 can be switched for use as LCD ports and as mask options, of which 3 can be switched for use as serial I/O ports) - Serial I/O: One system...