The HT93214 is a series of dialers designed for low-cost telephone set applications with expandable features such as lock function, keytone, and LCD display interface. With a 4x4 keyboard, it performs normal tone/pulse switchable dialing and provides one-key redialing function with a 32-digit memory for speed dialing. An on-chip oscillator is built-in to work with an external 3.58MHz crystal or ceramic resonator for accurate timing. The HT93214 provides 300ms (F1 key) and 600ms (F2 key) of flash time; Tone dialing and 10pps, 20pps selection with 1/2 M/B ratio for pulse.
The HT93214 series is a low‑cost telephone dialer IC designed for tone and pulse dialing with a 32‑digit memory for speed‑dialing. It supports hand‑free control, keytone output, and optional LCD interface. The device operates from 2.0 V to 5.5 V and includes an on‑chip oscillator that can be paired with a 3.58 MHz crystal or ceramic resonator.
The manual provides a detailed pin description, keyboard matrix layout, functional block diagram, and electrical characteristics such as current consumption, voltage thresholds, and timing parameters. It also covers mode selection (tone vs. pulse), flash key operation, and hand‑free function control. This manual is written in Chinese.
| Operating Voltage | 2.0 V ~ 5.5 V |
|---|---|
| Standby Current | 0.1 µA (typ.) |
| Memory Retention Current | 0.1 µA (typ.) |
| Input Low Voltage (VIL) | 0.2 V |
| Input High Voltage (VIH) | 0.8 V |
| Key‑in Debounce Time | 20 ms |
The device operates from 2.0 V to 5.5 V.
The HT93214 provides a 32‑digit memory for speed‑dialing.
The standby current is typically 0.1 µA.
Applying a negative‑going pulse to the HFI pin toggles the HFO pin, which enables the hand‑free function.