ICM7249 Datasheet, PDF (4/9 Pages) Intersil Corporation – 51/2 Digit LCD, Micro-Power Event/Hour Meter

Timing Waveforms
ICM7249
POWER ON
V_DD
RESET
t_r
OSC OUT
BP
1234 56
ON
SEGMENTS
OFF
SEGMENTS
511 512
ONE ¹/₂ BACKPLANE CYCLE
f₀ = 32.768kHz
f_BP = 32Hz
f_SEG = 32Hz
FIGURE 1. POWER ON/RESET WAVEFORMS
S/S VALID
S/S INVALID
S/S VALID
TIMING ACTIVE DURING INTERVAL
t_HP > 12.5ms
TIMING INTERMINATE DURING INTERVAL
t_HP
10ms < t_HP < 12.5ms
40Hz < f < 50Hz
TIMING ACTIVE DURING INTERVAL
t_HP
5µs ≤ t_HP ≤ 10ms
50Hz ≤ f ≤ 120kHz
FIGURE 2. START/STOP INPUT HIGH-PASS FILTERING IN TIMING MODES
9-26