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參數(shù)資料
| 型號(hào)： | PCA1070 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Multistandard programmable analog CMOS transmission IC |
| 中文描述： | 多標(biāo)準(zhǔn)傳輸可編程模擬CMOS集成電路 |
| 文件頁(yè)數(shù)： | 6/36頁(yè) |
| 文件大?。?/td> | 180K |
| 代理商： | PCA1070 |
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1997 Jun 20
6
Philips Semiconductors
Product specification
Multistandard programmable analog
CMOS transmission IC
PCA1070
DC
STARTING AND SETTLING TIME
The IC is equipped with circuitry for fast DC start-up. This
circuit is automatically activated as soon as V
DD
reaches
3 V after hook-off, and is deactivated when V
SLPE
drops
below 5.9 V. This ensures that only a relatively short time
is needed to reach the default DC setting (V
SLPE
) of the
circuit and that V
DD
will not exceed the maximum permitted
voltage of 6 V.
The start-up circuit can also be activated under software
control by setting bit code DST to logic 1 via the I
2
C-bus.
The start-up time can be optimized by programming the bit
code DST to logic 1 during the start-up procedure.
In practice this is possible as soon as the microcontroller
has become operational. The DST bit can also be used to
quickly restore the DC settings (V
SLPE
) after long line
breaks or during reprogramming of V
SLPE
.
It should be noted that the AC impedance into pin LN is
reduced considerably when DST = 1.
Power control
I
NTERNAL RESET
PCA1070
The PCA1070 has an internal reset circuit that monitors
the supply voltage V
DD
. If V
DD
is below the threshold level
(1.2 V) then the circuit is in reset-mode. In this mode the
current consumption is low and the internal reset is active
and writes the default values into all registers. The status
bit PRES will be set to logic 1. The microcontroller can
read this bit via the I
2
C-bus interface; once read it will be
set to logic 0 again.
When V
DD
passes the threshold (increasing V
DD
), the
circuit becomes partly active and the internal ring/speech
detector will be activated (see Section “Start-up and
switch-off behaviour”).
R
ESET OUTPUT FOR MICROCONTROLLER
The voltage at pin VMC (microcontroller supply voltage) is
monitored by a reset circuit. If V
VMC
is below the threshold
level the output RMC is set to logic 1. This threshold level
is 2 V in the normal operating and power-down mode and
2.1 V in the standby mode (see Fig.4).
P
OWER
-
DOWN
/
STANDBY MODES
The circuit can be set in power-down or standby mode.
These modes are intended for use with pulse dialling
during long line breaks and applications with memory
retention.
With control bits PDx = 01, the circuit is in the power-down
mode; the typical current consumption at pin V
DD
is
reduced from I
DD
= 2.3 mA to 30
μ
A; the typical current
consumption at pin VMC is 4
μ
A. When PDx = 11 the
circuit is in the standby mode and I
DD
and I
VMC
are
reduced to 2
μ
A. In both conditions (power-down and
standby) the voltage stabilizer will be disabled.
S
TART
-
UP AND SWITCH
-
OFF BEHAVIOUR
This description refers to the basic application where V
DD
and VMC are connected together and one supply
capacitor is used (see Fig.8).
Fig.4 VMC timing diagram.
handbook, halfpage
MGE339
0
VVMC
RMC
logic 1
low voltage
condition
VRESET
logic 0
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相關(guān)代理商/技術(shù)參數(shù) |
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| PCA1070P | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multistandard programmable analog CMOS transmission IC |
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| PCA-1-08-HU-3-50 | 功能描述:FFC & FPC連接器 8P R/A UPPER CONTACTS RoHS:否 制造商:JAE Electronics 產(chǎn)品類型:Plugs 系列:HD 節(jié)距:0.5 mm 位置/觸點(diǎn)數(shù)量:40 安裝角: 安裝風(fēng)格:Cable 外殼材料:Plastic 觸點(diǎn)材料:Copper Alloy 觸點(diǎn)電鍍:Gold 電壓額定值:100 V per contact 電流額定值:0.24 A to 1 A |
| PCA-1-08-V-3-20 | 功能描述:FFC & FPC連接器 8P TOP ENTRY THRU HOLE RoHS:否 制造商:JAE Electronics 產(chǎn)品類型:Plugs 系列:HD 節(jié)距:0.5 mm 位置/觸點(diǎn)數(shù)量:40 安裝角: 安裝風(fēng)格:Cable 外殼材料:Plastic 觸點(diǎn)材料:Copper Alloy 觸點(diǎn)電鍍:Gold 電壓額定值:100 V per contact 電流額定值:0.24 A to 1 A |
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