JT9648-AS

The JT9648-AS is a kind of single CMOS LSI for eletrical body thermometer capable of directly driving a 4-1/2 digit liquid crystal using a thermistor as a body heat sensor.

There are some features of JT9648-AS as follows: (1)display temperature range; 32.00 to 43.00; (2)resolution: 0.01; (3)accuracy: ±0.1; (4)max value holding function; (5)memorize last value; (6)voltage drop detecting function; (7)measured temperature stable detecting function; (8)power ON/OFF operation by a single switch; (9)automatic power OFF function (approx, 16 min); (10)full display function; (11)a single 1.5 V silver oxide battery; (12)4-1/2 digit, 1/3 duty, 1/2 bias liquid crystal direct driving; (13)buzzer output time (time elapsed or stable detection reporting).

The following is about the maximum ratings of JT9648-AS : (1)supply voltage 1, VSS1-VDD: -0.3 to 0.2 V; (2)supply voltage 2, VSS2-VDD: -6.0 to 0.2 V; (3)operating temperature, Topr: 0 to 50; (4)storage temperature, Tstg: -40 to 125. Then is about the electrical characteristics (referenced to VDD=0 V, VSS1=-1.55 V, VSS2=-3.0 V, FO=64.0 kHz, Ta=25): (1)output current segment, IOH1: -4.00 A max at VOH1=-0.3 V; (2)output current segment, IOL1: 4.00 A min at VOL1=-2.7 V; (3)output current COM VSS2, IOH2: -60.0 A max at VOH2=-0.3 V; (4)output current COM VSS2, IOL2: 60.0 A min at VOL2=-2.7 V; (5)output current COM VSS1, IOH3: -60.0A max at VOH3=-1.75 V; (6)out current COM VSS1, IOL3: 60.0A min at VOL3=-1.35 V.