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HT7500 Datasheet(PDF) 5 Page - Holtek Semiconductor Inc |
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HT7500 Datasheet(HTML) 5 Page - Holtek Semiconductor Inc |
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5 / 8 page  HT7500 5 August 8, 2000 Function Description · Power sw: push switch to power on or power off. · When power on: push the switch, then it will generate a ²beep² sound for 0.125 sec. a. First displays all the segments on for 2 sec. b. After a. as described above, then shows the last time measured temperature for 2 sec. c. After b., shows L °Cor °F for 0.75 sec. d. After c., displays the measured temperature, then °Cor °F mark will flash at a speed of 1Hz. e. If the temperature is < 32°C (or 90°F), the display shows L °C (or °F). f. If the temperature ³ 42°C (or 108°F the display shows H °C (or °F). g. The display always shows the higher temperature during the temperature measurement. h. If the measured temperature does not change for more than 16 sec., the measure- ment is over and the °C (or °F) mark flash stops. i. When measurement is over, if the temperature > 37.5°C (or 99.5°F) the buzzer alarms ²beep-beep-beep-beep- beep-beep-² for 4 sec, as follows: if the temperature £ 37.5°C (or 99.5°F), the buzzer alarms ²beep-beep-beep-beep-² for 4 sec, as follows: j. It will automatically turn the power off when measurement is over for 8 min 40 sec. k. When measurement is over, but if the temperature rises within 8 min 40 sec, the °C (or °F) mark will flash again (repeat from step 2-d), and starts to count 8 min 40 sec again. l. When beep sound is on for 4 sec, the temperature is not measured. · When power off: the standby current £ 1mA. · The frequency of the buzzer is 5.3kHz · Bonding option °Cor °F · Measurement to 0.1 degree in either °Cor °F · Sensor use 503ET · Reference resistor is the value (sensor in 37.0°C) · When battery voltage is low, the battery mark Ñ flashes at the speed of 1Hz and the mea- surement may not be accurate. The low volt- age detect: 1.35V ± 0.05V. · During the process of mass production, in or- der to adjust the reference resistance (RF), let test 2 be floating, the measured temperature will be the actual temperature of the mea- sured environment. It can be up or down, not always the higher one. BI 0. 5S 0. 5S BI BI 0. 12 5S 0. 12 5S 0. 12 5S 0. 12 5S BI 0. 12 5S 0. 12 5S 0. 37 5S |
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