MT8889CS1 Zarlink, MT8889CS1 Datasheet - Page 17

• Manufacturer Part Number: MT8889CS1
• Description: DTMF TXRX 3.579MHz CMOS 5V 20-Pin SOIC Tube
• Manufacturer: Zarlink

Specifications of MT8889CS1

• Package: 20SOIC
• Operating Frequency: 3.579 MHz
• Typical Supply Current: 7 mA
• Typical Operating Supply Voltage: 5 V
• Minimum Operating Supply Voltage: 4.75 V
• Maximum Operating Supply Voltage: 5.25 V

A software reset must be included at the beginning of all programs to initialize the control registers after power
up. The initialization procedure should be implemented 100ms after power up.
Description:
1) Read Status Register
2) Write to Control Register
3) Write to Control Register
4) Write to Control Register
5) Write to Control Register
6) Read Status Register
Transmit DTMF tones of 50 ms burst/50 ms pause and Receive DTMF Tones.
Sequence:
1) Write to Control Register A
2) Write to Control Register B
3) Write to Transmit Data Register
4) Wait for an Interrupt or Poll Status Register
5) Read the Status Register
NOTE: IN THE TX BURST MODE, STATUS REGISTER BIT 1 WILL NOT BE SET UNTIL 100 ms (
WRITTEN TO THE TX DATA REGISTER. IN EXTENDED BURST MODE THIS TIME WILL BE DOUBLED TO 200 ms (
Read the Receive Data Register
(tone out, DTMF, IRQ, Select Control Register B)
(burst mode)
(send a digit 7)
-if bit 1 is set, the Tx is ready for the next tone, in which case...
Write to Transmit Register
(send a digit 5)
-if bit 2 is set, a DTMF tone has been received, in which case....
-if both bits are set...
Read the Receive Data Register
Write to Transmit Data Register
TYPICAL CONTROL SEQUENCE FOR BURST MODE APPLICATIONS
INITIALIZATION PROCEDURE
RS0
Figure 17 - Application Notes
1
1
1
1
1
1
Motorola
RS0
1
1
0
1
0
0
0
0
Zarlink Semiconductor Inc.
MT8889C
R/W
1
0
0
0
0
1
R/W
0
0
1
0
1
1
0
0
17
WR
0
0
0
WR
0
0
1
1
1
1
0
0
0
0
1
Intel
RD
0
1
1
1
1
0
RD
1
1
1
0
1
0
0
1
1
0
0
X
0
X
X
0
b3
b3
X
0
0
1
0
X
±
2 ms) AFTER THE DATA IS
b2
1
0
1
X
1
X
X
1
b2
X
0
0
0
0
X
Data
b1
b1
0
0
1
X
0
X
X
0
X
0
0
0
0
X
±
Data Sheet
4 ms)
b0
1
0
1
X
1
X
X
1
b0
X
0
0
0
0
X