Matsushita and Panasonic Hall ICs
Contents
Overview
Matsushita and Panasonic made a number of Hall sensor IC models. DN837 is confirmed as being used in keyboard switches.
Models
DN830
DN830 is a discrete output Hall sensor, introduced at the Japan Electronics Show in 1973 in Osaka, as reported in Electronic Design magazine, December 20, 1973. DN830 offered a fanout of 8 for TTL/DTL, and “can be used for keyboard and other switches as well as speed and position sensing.” DN830 is dual-output current sinking.
DN831
DN831, introduced at the same time as DN830, is a linear model with analogue output.
DN837
DN837 is a tiny Hall sensor found in the Omron B2H-F7W switch. It is an open collector (current sink) model with dual outputs, identical in arrangement to early Micro Switch SW and Micro Switch SD sink level switches. At 7.2 × 7.2 × 2.2 mm, it is the smallest known Hall IC, being smaller than the better-known 10 × 6.5 × 2.1 mm Siemens package (copied by HFO and used in RAFI keyboards).
DN837 Hall sensor IC
DN837 is documented as follows (translated from Japanese for convenience):
特徴 (Special characteristics)
-
電源電圧5Vで動作
Operates at 5 V supply voltage -
出力はオープンコレクタで，耐圧が20V以上あり，MOS ICを直接駆動可能
Output is open collector, withstand voltage of 20 V or more, and can directly drive MOS ICs -
接点部分がないので，寿命は半永久的
Life is semi-permanent because there are no contact points -
動作速度は従来のスイッチに比べて高速
Operating speed is faster than conventional switches -
小さな磁石で駆動可能
Can be driven with a small magnet
用途 (Use)
-
キーボードスイッチ
Keyboard switches -
スピードセンサ
Speed sensors -
マイクロスイッチ
Microswitches -
位置センサ
Position sensors
Documentation
- DN837 Hall IC datasheet (four-terminal with redundant outputs)