W925EP01 Datasheet, PDF (106/108 Pages) Winbond – 8-BIT CID MICROCONTROLLER

W925EP01/ W925EP01FG
Note :
1. FSK input data rate at 1200 +/- 12 baud.
2. OSCI frequency at 4 MHz +/- 0.1%.
"‡" Typical figure are at V_DD = 5V and temperature = 25 ℃ are design aids only, not guaranteed and not subject to production
testing.
DTMF Decoder
PARAMETER
SYMBOL MIN
INPUT SENSITIVITY PER TONE
-29
Positive and negative twist accept
7
Frequency Deviation accept
1.5
Frequency Deviation reject
3.5
3rd Tone Tolerance
Noise Tolerance
Dial tone Tolerance
Note :
1. signal consists of all DTMF tones.
2. Tone duration is 40mS at least, tone pause duration is 40mS at least.
3. Referenced to the lowest level frequency component in DTMF signal.
4. Referenced to the minimum valid accept level.
TYP
22
MAX
1
-16
-12
UNITS
dBm
dB
%
%
dB
dB
dB
NOTES
1,2
1,2
1,2
1,2
1,2,3
1,2,3
1,2,4
DTMF Detection Interface
PARAMETER
CONDITION SYMBOL MIN _TYP^‡ MAX UNITS NOTES
DTMF present detect time
Est
DTMF absent detect time
t_FP
0.5
t_FA
0.1
8
MS
8
MS
DTMF Detected Duration
DTMFD=1
t_DD
40
MS
DTMF Signal Ignore Time
DTMFD=0
t_DI
20
MS
DTMF Pause Accept Time DTMFD=1
t_DPA
20
MS
"‡" Typical figure are at V_DD = 5V and temperature = 25 ℃ are design aids only, not guaranteed and not subject to production
testing.
- 106 -