W91510DN Datasheet, PDF (4/30 Pages) Winbond – TONE/PULSE DIALER WITH RTC AND LCD DISPLAY FUNCTION

Preliminary W91510DN SERIES
Pin Description, continued
SYMBOL PIN NO.
HFI _, ^HFO
25, 10
DP _/ C6
11
DTMF
6
VLCD
CP, CN
29
31, 32
I/O
FUNCTION
I, O _{Handfree control pins. A low pulse on the HFI input pin toggles}
the handfree control state.
Status of the handfree control is listed in the following table:
CURRENT STATE
Hook SW. HFO
Low
On Hook
Off Hook
On Hook
High
High
Off Hook
Off Hook
Low
High
NEXT STATE
Input
HFO Dialing
HFI
High Yes
HFI
Low No
HFI
Low Yes
Off Hook Low Yes
On Hook Low No
On Hook High Yes
HFI pin is pulled to VDD by internal resistor.
Detailed timing diagrams are shown in Figure 4(a), 4(b).
O This pin is a CMOS N-channel open drain output. Flash key will
cause DP to go active in either pulse mode or tone mode. In
lock mode, the DP keeps low for 300 mS during off-hook delay
time. The timing diagram is shown as Figure 1(a), 1(b), 1(c),
1(d).
O In pulse mode, this pin remains in low state at all time.
In tone mode, it will output a dual or single tone. Detailed timing
diagram for tone mode is shown in Figure 2(a), 2(b), 2(c), 2(d).
OUTPUT FREQUENCY
Specified Actual Error %
R1 697
R2 770
699 +0.28
766 - 0.52
R3 852
848 - 0.47
R4 941
C1 1209
948
1216
+0.74
+0.57
C2 1336
1332 - 0.30
C3 1477
1472 - 0.34
O Power supply pin for LCD driver.
A 0.1 µF capacitor is connected between VLCD and VSS.
I CP is the voltage control capacitor positive pin.
CN is the voltage control capacitor negative pin.
A 0.1 µF capacitor is connected between these two pins.
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