MSP 3400C
PRELIMINARY DATA SHEET
5.3. Start Up Sequence
After power on or RESET, the IC is in an inactive state.
The CCU has to transmit the required coefficient set for
2
a given operation via the I C bus. Initialization must start
with the demodulator part. If required for any reason, the
audio processing part can be loaded before the demo-
dulator part.
The reset pin should not be >0.45 DVSUP (see recom-
mended operation conditions) before the 5 Volt digital
power supply (DVSUP) and the analog power supply
(AVSUP) are >4.75 Volt and the MSP-Clock is running
(Delay: 2 ms max, 0.5 ms typ.).
This means, if the reset low-high edge starts with a delay
of 2 ms after DVSUP>4.75 Volt and AVSUP>4.75 Volt,
even under worst case conditions, the reset is ok.
DVSUP/V
AVSUP/V
4.75
time / ms
time / ms
time / ms
Oscillator
max. 2
RESETQ
min. 2
0.45 * DVSUP
Note: The reset should
not reach high level be-
fore the oscillator has
started. This requires a
reset delay of >2 ms
Fig. 5–3: Power-up sequence
MICRONAS INTERMETALL
19
MICRONAS [ MICRONAS ]
