N681622YG Nuvoton Technology Corporation of America, N681622YG Datasheet - Page 33

• Manufacturer Part Number: N681622YG
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of N681622YG

• Lead Free Status / RoHS Status: Supplier Unconfirmed

The ramp rate for steps 2 and 4 above is determined by the Ramp Rate bit APG:RAMP[7].
A Wink function is used for the ‘message waiting’ lamp in telephone sets. For this function to take place no Linefeed
state change is necessary. The Wink function is a variation of Soft Polarity Reversal but without any Linefeed state
change. In this case Soft Polarity reversal is enabled as before (APG:PREN[6] address (0x40) bit to “1”, with
APG:RAMP[7] address (0x40) selecting the ramp rate). Now the OHV:VOHZ[5] address (0x4C) bit can be used to
directly ramp the RING line towards 0V or back to V
is V
return to the nominal V
APG
APG
APG
LS
OHV
It is a common requirement for electronic circuits to have to withstand some degree of over-voltage and/or reverse
voltage on the power-supply lines. Integrated circuits are designed to operate from a nominal 3.3V power supply.
Some kind of protection circuit is therefore needed to prevent voltages greater than the maximum allowable from
being applied to the IC pins. The N681386/87 device needs to be protected from surges and AC power shorts. This
should be implemented using external components and a variety of commercial approaches are typically employed.
However, N681386/87 device has on-chip voltage and line monitoring capabilities which allow the system to report
line faults, crossovers, and other line conditions in order to facilitate remote service. It also has sense inputs can be
configured such that blown fuse can be detected. The on-chip DC/DC controller is equipped with three protection
shutdown mechanisms. It detects
A counter is tracking the three cases of DC/DC power alarm. The counter will automatically reset upon being read,
allowing the user to monitor the number of power alarms within a specific time period. This register is a read ONLY
register resets upon a read command.
Register
Preliminary Datasheet Rev1.0
GM
a)
b)
c)
+V
12.1.2. OVER-VOLTAGE PROTECTION
DCDC output voltage (VBAT) 10% above full scale or
DCDC supply voltage (VDDC) too low or
DCDC supply current (I
OH
. If VOHZ bit is set to “1” the Ring Voltage will ramp towards 0V. If the bit is toggled it will eventually
VOHZ[5]
PRE[6]
RAMP[7]
LS[3:0]
SB[6]
12.1.1.5.
Bit(s)
RING
WINK FUNCTION POLARITY REVERSAL
setting. The user has full control of the Wink function cadence.
Address
0x4C
0x40
0x40
0x40
0x44
VDDC
) too high;
Table 10: Registers for Polarity Reversal
Wink Function (Smooth transition to V
Soft Polarity Reversal Enable
Soft Polarity Reversal Ramp Rate
Polarity Reversal Status (Sign)
Linefeed Status
Page 33 of 164
RING
. For example, in Forward Idle mode V
Parameter
Single Programmable Extended Codec/SLCC
OH
=0V)
0 = Return to previous V
1 = Ramp to 0V
0 = Disabled
1 = Enabled
0 = 1.5 V/125 µs
1 = 3.0 V/125 µs
0 = Forward
1 = Reverse
Programmable Range
N681386/87
TIP
is at V
January 2010
GM
and V
RING
OH