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| 型号： | CPC7591MC |
| 厂商： | CLARE INC |
| 元件分类： | 通信及网络 |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO16 |
| 封装： | MLP-16 |
| 文件页数： | 5/17页 |
| 文件大小： | 391K |
| 代理商： | CPC7591MC |
CPC7591
R01
www.clare.com
13
Whenever the LATCH enable control pin is at logic 1,
the data latch is active and data is locked. Subsequent
INRINGING input changes will not result in a change to
the control logic or affect the existing switch state.
The switches will remain in the state they were in
when the LATCH pin changes from logic 0 to logic 1
and will not respond to changes in input as long as the
LATCH is at logic 1. However, neither the TSD input
nor the TSD output control functions are affected by
the latch function. Since internal thermal shutdown
control and external “All-off” control is not affected by
the state of the LATCH enable input, TSD will override
state control.
2.5 TSD Pin Description
The TSD pin is a bi-directional I/O structure with an
internal pull-up current source with a nominal value of
16
A biased from VDD. As an output, this pin
indicates the status of the thermal shutdown circuitry.
Typically, during normal operation, this pin will be
pulled up to VDD but under fault conditions that create
excess thermal loading the CPC7591 will enter
thermal shutdown and a logic low will be output.
As an input, the TSD pin is utilized to place the
CPC7591 into the “All-Off” state by simply pulling the
input low. For applications using low-voltage logic
devices (lower than VDD), Clare recommends the use
of an open-collector or an open-drain type output to
control TSD. This avoids sinking the TSD pull up bias
current to ground during normal operation when the
all-off state is not required. In general, Clare
recommends all applications use an open-collector or
open-drain type device to drive this pin.
2.6 Ringing Switch Zero-Cross Current Turn Off
After the application of a logic input to turn SW4 off,
the ringing switch is designed to delay the change in
state until the next zero-crossing. Once on, the switch
requires a zero-current cross to turn off, and therefore
should not be used to switch a pure DC signal. The
switch will remain in the on state no matter the logic
input until the next zero crossing. These switching
characteristics will reduce and possibly eliminate
overall system impulse noise normally associated with
ringing switches. See Clare application note AN-144,
more information. The attributes of ringing switch SW4
may make it possible to eliminate the need for a
zero-cross switching scheme. A minimum impedance
of 300
in series with the ringing generator is
recommended.
2.7 Power Supplies
Both a +5 V supply and battery voltage are connected
to the CPC7591. Switch state control is powered
exclusively by the +5 V supply. As a result, the
CPC7591 exhibits extremely low power consumption
during active and idle states.
Although battery power is not used for switch control, it
is required to supply trigger current for the integrated
internal protection circuitry SCR during fault
conditions. This integrated SCR is designed to
activate whenever the voltage at TBAT or RBAT drops 2
to 4 V below the applied voltage on the VBAT pin.
Because the battery supply at this pin is required to
source trigger current during negative overvoltage
fault conditions at tip and ring, it is important that the
net supplying this current be a low impedance path for
high speed transients such as lightning. This will
permit trigger currents to flow enabling the SCR to
activate and thereby prevent a fault induced negative
overvoltage event at the TBAT or RBAT nodes.
2.8 Battery Voltage Monitor
The CPC7591 also uses the VBAT pin to monitor
battery voltage. If system battery voltage is lost, the
CPC7591 immediately enters the all-off state. It
remains in this state until the battery voltage is
restored. The device also enters the all-off state if the
system battery voltage rises more positive than about
–10 V with respect to ground and remains in the all-off
state until the battery voltage drops below
approximately –15 V with respect to ground. This
battery monitor feature draws a small current from the
battery (less than 1
A typical) and will add slightly to
the device’s overall power dissipation.
This monitor function performs properly if the
CPC7591 and SLIC share a common battery supply
origin. Otherwise, if battery is lost to the CPC7591 but
not to the SLIC, then the VBAT pin will be internally
biased by the potential applied at the TBAT or RBAT
pins via the internal protection circuitry SCR trigger
current path.
2.9 Protection
2.9.1 Diode Bridge/SCR
The CPC7591 uses a combination of current limited
break switches, a diode bridge/SCR clamping circuit,
and a thermal shutdown mechanism to protect the
SLIC device or other associated circuitry from damage
during line transient events such as lightning. During a
positive transient condition, the fault current is
conducted through the diode bridge to ground via
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