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參數(shù)資料
| 型號(hào)： | CA3277 |
| 廠商： | Intersil Corporation |
| 英文描述： | Dual 5V Regulator with Serial Data Buffer Interface for Microcontroller Applications(雙路5V穩(wěn)壓器（帶串行數(shù)據(jù)緩沖器接口）) |
| 中文描述： | 雙5V穩(wěn)壓器與串行數(shù)據(jù)緩沖器，用于微控制器應(yīng)用（雙路5V的穩(wěn)壓器接口（帶串行數(shù)據(jù)緩沖器接口）） |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 75K |
| 代理商： | CA3277 |
7-42
CA3277
Applications
Other functions of the CA3277 include a Data Comparator
and Current Multiplier for use as interface buffers to transfer
serial data at higher level logic to and from a remote host
microcontroller. The OUT1 5V Standby Supply provides
power to the local microcontroller which interfaces to the
CA3277 interface buffers at a 5V logic level. As shown in
Figure 1, the DATA IN input of the Data Comparator receives
serial data referenced to the BATT voltage level. The output
of the Data Comparator is 5V CMOS compatible logic and is
connected to the RDI (remote data input) terminal of the
microcontroller. The TDO (data out) output of the microcon-
troller is connected to the Current Multiplier input of the
CA3277.
Current Multiplier -
The Current Multiplier, with internal cir-
cuitry shown in Figure 2, receives data from the
microcontroller in the form of an open drain or gate switched
output driving a 22K
resistor load in series to the Current
Input at pin 10 (CUR IN). The input stage of the Current Mul-
tiplier is a current mirror amplifier which is internally
connected to the 5V regulated OUT1 voltage source. The
output stage of the Current Multiplier is a current mirror
amplifier referenced to GND and has an open collector
Current Output at pin 9 (CUR OUT), with a minimum drive
capability of 35mA. The Current Multiplier output load is
normally connected via resistive loading to the BATT voltage
supply level. As such, the microcontroller transmits data out
(TDO output) to the input of the CA3277 Current Multiplier
which amplifies and translates the signal back to the voltage
reference level of the BATT power supply input. When
driving a similar remote CA3277, the voltage drop from the
BATT input line switches the Data Comparator which
provides serial data to the RDI input of the remote microcon-
troller. The nominal current gain of the Current Multiplier is
100X.
The application use of the Current Multiplier is not limited to
digital serial data transfer. The Current Multiplier is an
independent function and is open to use for other purposes,
including linear signal amplification, sensor output amplifica-
tion and current controlled threshold switching. The current
output terminal, CUR OUT may be externally load-
connected to OUT1, OUT2, BATT or any other power supply
level up to the maximum ratings given for the BATT input
terminal. It is important to note that some applied uses of the
Current Multiplier may contribute significant on-chip power
dissipation. A nominal current mirror input drive of 200
μ
A will
provide sufficient drive to switch a 250
resistor load at the
input of the data comparator. As such, the quiescent OFF
condition of the Data comparator should be in the High state.
FIGURE 1. TYPICAL APPLICATION CIRCUIT OF THE CA3277 DUAL 5V REGULATOR WITH MICROCONTROLLER AND SERIAL
DATA BUFFER INTERFACE TO A REMOTE HOST
IGN IN
BATT
CUR OUT
CUR
IN
(OUT2)
EN
DATA
OUT
IGN
OUT
CRST
RESET
OUT2
GND
OUT1
47K
0.01
μ
F
0.47
μ
F
22k
100
μ
F
0.1
μ
F
TO
OUT2
+5V
DISPLAY OR
CONTROL
OUTPUT
BUS
5V MICROCONTROLLER
TDO
CONTROL
OUT
RDI SENSE
IN
RESET VDD
VSS
+5V
CMOS
MEMORY
DATA IN
UNREG
SUPPLY IN
IGN IN
220
0.1
μ
F
330
150
μ
H
+5V ENABLE
SWITCHED
OUTPUT
+5V
C2
(V
BATT
-2.9V)
DATA
6V
ERROR AMP
AND OUTPUT
CONTROL
FB
FB
STANDBY
OUTPUT
LOW VOLT
RESET
SHTDWN
BANDGAP
REF
LOW VOLT
OVR-VOLT
SHTDWN
IGNITION
COMP
COMP
CURRENT
AMP
I
OVR-TEMP
SHTDWN
OUT2
ENABLE
ERROR AMP
AND OUTPUT
CONTROL
R1
C1
L1
R4
C3
C4
R5
C7
C8
CA3277
200
μ
F
22
μ
F
0.1
μ
F
C5
C6
NOTE:
DATA IN and CUR OUT are remote/host Serial Data Communication Buffers. Typical Remote Source
Impedance for DATA IN is 1k
. Typical Remote Load for CUR OUT is 250
.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CA3277E | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| CA3277E WAF | 制造商:Harris Corporation 功能描述: |
| CA327AM | 制造商:Harris Corporation 功能描述: |
| CA327Q | 制造商:Harris Corporation 功能描述: |
| CA3280 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Dual, 9MHz, Operational Transconductance Amplifier (OTA) |
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