oh1 7 7 bipolar hall effect switch ic page 1 nanjing nanjing nanjing nanjing ouzhuo ouzhuo ouzhuo ouzhuo technology technology technology technology co., co., co., co., ltd ltd ltd ltd www.ohhall.com www.zbling.com tel 86- 25-52312738 86-25- 83247886 fax: 86-25-52312738 e-mail: ohhall@163.com order order order order information information information information p n oh1 7 7 operate temperature - 4 0 85 package 1000 pcs / bag general general general general description description description description : : : : oh1 7 7 bipolar ic is a switched hall-effect ic which is for contactless switching applications. the device includes an on-chip hall voltage generator for magnetic sensing, an amplifier that amplifies the hall voltage, a schmitt trigger to provide switching hysteresis for noise rejection, and an open-collector output. features features features features ? 4 .5v to 2 4 v dc operation voltage ? open-collector pre-driver ? 25ma maximum sinking output current. ? reverse polarity protection absolute absolute absolute absolute maximum maximum maximum maximum ratings ratings ratings ratings t a =25 supply voltage v cc 4. 5-24v output current i o 2 0 ma operating temperature range t a - 4 0 85 storage temperature range t s -55 150 electrical electrical electrical electrical characteristics characteristics characteristics characteristics (ta= 25 c ) parameter symbol conditions value unit min typ max supply voltage v cc 4.5 - 24 v output saturation voltage v ol vcc=4.5v, rl = 2k b b op - 200 400 mv output leakage current i oh vout= vccmax b b rp - 1.0 10 a supply current i cc v cc = vccmax oc output - 3 5 ma output rise time t r vcc=12v, r l =820 , c l =20pf - 0.12 1.20 s output falling time t f - 0.14 1.40 s applications applications applications applications ? position detection ? flow measurement ? cpu fan magnetic-electrical magnetic-electrical magnetic-electrical magnetic-electrical transfer transfer transfer transfer characteristics characteristics characteristics characteristics functional functional functional functional block block block block diagram diagram diagram diagram reg reg reg reg m amp pin1.v cc pin3.vout pin2.gnd v out b h b b rp b op v oh 0 v out b h b b rp b op v oh 0 v out b h b rp b op b v oh v ol 0
oh1 7 7 bipolar hall effect switch ic page 2 nanjing nanjing nanjing nanjing ouzhuo ouzhuo ouzhuo ouzhuo technology technology technology technology co., co., co., co., ltd ltd ltd ltd www.ohhall.com www.zbling.com tel 86- 25-52312738 86-25- 83247886 fax: 86-25-52312738 e-mail: ohhall@163.com magnetic magnetic magnetic magnetic characteristics characteristics characteristics characteristics (ta= 25 c ) (1mt = 10 gauss) parameter symbol value unit min typ max operate point b op 5 - 10 mt r elease point b rp -1 - 4 mt hysteresis b h - 6 - mt test test test test circuit circuit circuit circuit for for for for reference reference reference reference dimension dimension dimension dimension unit:mm) unit:mm) unit:mm) unit:mm) vout vcc r l r l =820 c l =20 pf c l pin pin pin pin descriptions descriptions descriptions descriptions 1. v cc 2. gnd 3. vout caution: 1)when installing, please minimize mechanical stress on the ic shell and leads. 2)welding temperature should be lower than 260 , less than 3 seconds. 3)ic is oc output, so a pull-up resistor connected pin 1 (power) and pin 3 (output) is necessary.
|
