LC72346W

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 kHz 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 mVrms (50 mVrms at 130 MHz or higher frequency) AM band (high, low): 35 mVrms 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 75kHz crystal oscillation Stack: 8 levels LCD driver: 48 to 80 segments (1/4 duty, 1/2 bias drive) Interrupts: Two external interrupts...