ml7020mb Oki Semiconductor, ml7020mb Datasheet - Page 15

• Manufacturer Part Number: ml7020mb
• Description: 1200 Bps Modem For Remote Control Systems
• Manufacturer: Oki Semiconductor

*[O]: Operating condition, [–]: Power down condition
Note 1: Tone 1, 2, 3 modes
Note 2: Loop back mode
Note 3: Power down mode
1 Semiconductor
MODE2 MODE1 MODE0 Mode name Modulator
MODE2 to MODE0
These registers are used for setting the mode. The contents of setting are shown in Table 3.
0
0
0
0
1
1
1
1
The DTMF detection timing is different in the tone 1, 2, loop back modes from that in the tone 3
In the tone 3 mode, the DTMF detection goes into the high speed detection mode. In this
The modem loop back mode is initiated when SW5CONT is High and MOD-DT_ON is High.
(The data input in XD is output from RD via the internal circuits.)
The DTMF loop back mode is initiated when SW5CONT is Low and MOD-DT_ON is High.
(The data set in PBG3 to PBG0 is latched at the rising edge of MOD-DT_ON, and is output at
The conditions when the LSI is put in the power down mode are listed below.
Each blocks:
Analog output pins:
DETB, RD, CLKO pins:
SP, X2 pins:
Processor interface registers:
mode.
mode, since the detector can make incorrect detection due to voice signals or noise, avoid
using the tone 3 mode if there is any margin available in the timing.
PBR3 to PBR0 via the internal circuits.)
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
transmission
Power down
Loop back
reception
(Note 1)
(Note 1)
(Note 1)
(Note 2)
(Note 3)
Modem
Modem
Tone 1
Tone 2
Tone 3
Test
Table 3 List of mode settings
section
O
O
–
–
–
–
–
Stop operating and the internal circuits are reset.
Go to the high-impedance state
High level
Low level
Low level (excepting SW1CONT, MODE2, 1, 0)
Demodulator
section
O
O
–
–
–
–
–
Operation of different blocks
transmission
LSI internal test
DTMF
O
O
O
–
–
–
–
reception
DTMF
O
O
O
O
–
–
–
transmission
CPT
O
O
O
O
O
–
–
FEDL7020-02
ML7020
reception
CPT
O
O
15/19
–
–
–
–
–