MT3170B データシートの表示（PDF） - Mitel Networks
部品番号
コンポーネント説明
一致するリスト
MT3170B Datasheet PDF : 11 Pages
| |||
MT3170B/71B, MT3270B/71B, MT3370B/71B
Serial Data (SD) Output
When a valid DTMF signal burst is present, ESt or
DStD will go high. The application of four clock
pulses on the ACK pin will provide a 4-bit serial
binary code representing the decoded DTMF digit on
the SD pin output. The rising edge of the first pulse
applied on the ACK pin latches and shifts the least
significant bit of the decoded digit on the SD pin.
The next three pulses on ACK pin will shift the
remaining latched bits in a serial format (see Figure
5). If less than four pulses are applied to the ACK
pin, new data cannot be latched even though ESt/
DStD can be valid. Clock pulses should be applied
to clock out any remaining data bits to resume
normal operation. Any transitions in excess of four
pulses will be ignored until the next rising edge of the
ESt/DStD. ACK should idle at logic low. The 4-bit
binary representing all 16 standard DTMF digits are
shown in Table 1.
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).
FLOW
FHIGH
DIGIT b3
b2
b1
b0
697 1209
1
0001
697 1336
2
0010
697 1477
3
0011
770 1209
4
0100
770 1336
5
0101
770 1477
6
0110
852 1209
7
0111
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
Note:
0= LOGIC LOW, 1= LOGIC HIGH
Table 1. Serial Decode Bit Table
b0=LSB of decoded DTMF digit and shifted out first.
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
4-6
Share Link: 