ICM7249 Intersil Corporation, ICM7249 Datasheet
ICM7249
Related parts for ICM7249
ICM7249 Summary of contents
Page 1
... The chip offers four timing modes, eight counting modes and four test modes. The ICM7249 lead device, powered by a single DC voltage source and controlled by a 32.768kHz quartz crystal. No other external components are required. Inputs to the chip are TTL-compatible and outputs drive standard direct drive LCD segments ...
Page 2
... Functional Block Diagram OSC IN OSC OSC OUT S/S VOLTAGE V+ REGLATOR SEG 7 SEG 7 SEG DEC DEC DEC ICM7249 1Hz 15 2 DIVIDER 32Hz SWITCH DEBOUNCE SEG 7 SEG 7 SEG DEC DEC DEC A1 9-24 6 SEC ...
Page 3
... Internal reset to 00000 requires a maximum V 2. Operating current is measured with the LCD disconnected, and input current I 3. Inputs are latched internally and draw no DC current after switching. During switching peak current may be drawn for 10ns. ICM7249 Thermal Information Thermal Resistance (Typical, Note ...
Page 4
... ON xxxxxxxx SEGMENTS xxxxxxxx xxxxxxxx OFF xxxxxxxx SEGMENTS TIMING ACTIVE DURING INTERVAL S/S VALID S/S INVALID S/S VALID FIGURE 2. START/STOP INPUT HIGH-PASS FILTERING IN TIMING MODES ICM7249 511 512 FIGURE 1. POWER ON/RESET WAVEFORMS t > 12.5ms HP TIMING INTERMINATE DURING INTERVAL t HP 40Hz < ...
Page 5
... FIGURE 3. WINK WAVEFORMS IN TIMING MODES COUNT WITH OR WITHOUT DEBOUNCE S/S VALID S/S INVALID S/S VALID FIGURE 4. START/STOP INPUT DEBOUNCE FILTERING IN COUNTING MODES S FIGURE 5. WINK WAVEFORMS IN COUNTING MODES ICM7249 TIMING ACTIVE 1 16 WINK GOES IN PHASE t > 12.5ms DE COUNT WITHOUT DEBOUNCE UNKNOWN RESULTS WITH DEBOUNCE t DE 40Hz < ...
Page 6
... Seven-Segment LCD Output Seven-Segment LCD Output Seven-Segment LCD Output Seven-Segment LCD Output Seven-Segment LCD Output Seven-Segment LCD Output Seven-Segment LCD Output. ICM7249 ALL SEGMENTS ON ALL SEGMENTS OFF FIGURE 6. DISPLAY TESTING PIN ...
Page 7
... Wink Segment The wink segment is provided as a annunciator to indicate the ICM7249 is working. It can be connected to any kind of annun- ciator on an LCD, like the flashing colons in a clock type LCD. In the timer modes, the wink segment flashes while timing is taking place ...
Page 8
... ICM7249 Applications A typical use of the ICM7249 is seen in Figure 8, the Motor Hour Meter. In this application the ICM7249 is configured as an hours-in-use meter and shows how many whole hours of line voltage have been applied. The resistor network and high-pass filtering allow AC line activation of the S/S input. ...
Page 9
... However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see web site http://www.intersil.com ICM7249 20k S/S ICM7249 +3V L FIGURE 9 ...