KA8601C
SPEAKER PHONE WITH SPEECH NETWORK
1. Receive Mode
2. Transmit Mode
3. Slow Idle Mode
4. Fast Idle Mode
Which of the above modes is to be determined depending on the following conditions:
1) Receive Mode
DETOTX1 < DETORX1, DETOTX2 < DETORX2, PDTX, X, PDRX : 1
2) Transmit Mode
DETOTX1 > DETORX1, DETOTX2 > DETORX2, PDTX : 1, PDRX : X
3) Slow Idle Mode
DETOTX1 > DETORX1, DETOTX2 > DETORX2, PDTX : 0, PDRX : X
DETOTX1 < DETORX1, DETOTX2 < DETORX2, PDTX : 0, PDRX : X
DETOTX1 < DETORX1, DETOTX2 > DETORX2, PDTX : 0, PDRX : X
DETOTX1 > DETORX1, DETOTX2 < DETORX2, PDTX : 0, PDRX : X
4) Fast Idle Mode
DETOTX1 > DETORX1, DETOTX2 < DETORX2, PDTX : 0, PDRX : 0
DETOTX1 < DETORX1, DETOTX2 > DETORX2, PDTX : Y, PDRX : Y
* "<" and ">" refer to voltage level : "X" refers to "It doesn't matter : "Y" is not zero
5. SWITCHING TIME
The switching time of the speaker phone is determined by the CT and RT of the outside elements.
1. Idle Mode → RX or TX Mode
ST = 4,000 X CT
2. TX or RX Mode → Fast Idle Mode
ST = 2,000 X CT
3. TX or RX Mode → Slow Idle Mode
ST = RT X CT
* CT, RT refer to the capacitor and resistor between Pin 34 and VCC.