MT3170BE1 データシートの表示（PDF） - Zarlink Semiconductor Inc
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MT3170BE1 Datasheet PDF : 15 Pages
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MT3170B/71B, MT3270B/71B, MT3370B/71B
Data Sheet
FLOW
FHIGH
DIGIT b3
b2
b1
b0
852 1336
8
1000
852 1477
9
1001
941 1336
0
1010
941 1209
*
1011
941 1477
#
1100
697 1633
A
1101
770 1633
B
1110
852 1633
C
1111
941 1633
D
0000
0= LOGIC LOW, 1= LOGIC HIGH
Table 1 - Serial Decode Bit Table
Note: b0=LSB of decoded DTMF digit and shifted out first.
Powerdown Mode (MT317xB/337xB)
The MT317xB/337xB devices offer a powerdown function to preserve power consumption when the device is not in
use. A logic high can be applied at the PWDN pin to place the device in powerdown mode. The ACK pin should be
kept at logic low to avoid undefined ESt/DStD and SD outputs (see Table 2).
ACK (input)
PWDN (input)
ESt/DStD (output)
SD (output)
low
low
low
high+
high
low
high
high
+ =enters powerdown mode on the rising edge.
Refer to Fig. 4 for
timing waveforms
Refer to Fig. 4 for
timing waveforms
low
low
low
undefined
undefined
undefined
Table 2 - Powerdown Mode
MT317xB/337xB
status
normal operation
powerdown mode
undefined
undefined
Frequency 1 (Hz)
350
425
400
480
440
480
440
480
Frequency 2 (Hz)
On/Off
Description
440
continuous
North American Dial Tones
---
continuous
European Dial Tones
---
continuous
Far East Dial Tones
620
0.5s/0.5s
North American Line Busy
---
0.5s/0.5s
Japanese Line Busy
620
0.25s/0.25s
North American Reorder Tones
480
2.0s/4.0s
North American Audible Ringing
620
0.25s/0.25s
North American Reorder Tones
Table 3 - Call Progress Tones
5
Zarlink Semiconductor Inc.
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