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BU1852GUW Datasheet(PDF) 1 Page - Rohm |
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BU1852GUW Datasheet(HTML) 1 Page - Rohm |
1 / 26 page BU1852GXW 1/25 www.rohm.com 2012.08 - Rev.B © 2012 ROHM Co., Ltd. All rights reserved. GPIO ICs Keyencoder IC BU1852GUW, BU1852GXW ● Description Keyencoder IC BU1852 can monitor up to 8x12 matrix (96 keys), which means to be adaptable to Qwerty keyboard. We adopt the architecture that the information of the only key which status is changed, like push or release, is encoded into the 8 bits data. This can greatly reduce the CPU load which tends to become heavier as the number of keys increase. (Previously, all key's status is stored in the registers.) When the number of keys is small, the extra ports can be used as GPIO. Furthermore, auto sleep function contributes to low power consumption, when no keys are pressed. It is also equipped with the various functions such as ghost key rejection, N-key Rollover, Built-in power on reset and oscillator. ● Features 1) Monitor up to 96 matrix keys. 2) Under 3µA Stand-by Current 3) Built-in Power on Reset. 4) Ghost key rejection. 5) Keyscan / GPIO selectable 6) 3 volt tolerant Input ● Absolute maximum ratings (Ta=25℃) Parameter Symbol Ratings Unit Conditions Supply Voltage VDD -0.3 ~ +2.5 V VDD≦VDDIO VDDIO -0.3 ~ +4.5 V Input voltage VI1 -0.3 ~ VDD +0.3※ 1 V XRST, XI, TW, PORENB VI2 -0.3 ~ VDDIO +0.3※ 1 V ADR VIT -0.3 ~ +4.5 V XINT, SCL, SDA, COL[11:0], ROW[7:0] Storage temperature range Tstg -55 ~ +125 ℃ Package power PD 272※ 2 mW ※ This IC is not designed to be X-ray proof. ※ 1 It is prohibited to exceed the absolute maximum ratings even including +0.3 V. ※ 2 Package dissipation will be reduced each 2.72mW/℃ when the ambient temperature increases beyond 25℃. ● Operating conditions Parameter Symbol Ratings Unit Conditions Min. Typ. Max. Supply voltage range (VDD) VDD 1.65 1.80 1.95 V Supply voltage range (VDDIO) VDDIO 1.65 1.80 3.60 V Input voltage range VI1 -0.2 - VDD+0.2 V XRST, XI, TW, PORENB VI2 -0.2 - VDDIO+0.2 V ADR VIT -0.2 - 3.60 V XINT, SCL, SDA, COL[11:0], ROW[7:0] Operating temperature range Topr -30 25 +85 ℃ No.11098EBT04 |
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