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參數(shù)資料
| 型號(hào)： | LTC1840 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | DC/DC變換器 |
| 英文描述： | RSO-S_D(Z) Series - Econoline Regulated DC-DC Converters; Input Voltage (Vdc): 12V; Output Voltage (Vdc): 05V; Power: 1W; 2:1 and 4:1 Wide Input Voltage Ranges; 1kVDC, 2kVD & 3kVDC Isolation; UL94V-0 Package Material; Continuous Short Circuit Protectionwith Current Foldback; Low Noise; No External Capacitor needed; Efficiency to 83% |
| 中文描述： | 雙風(fēng)扇控制器，帶有2線接口 |
| 文件頁(yè)數(shù)： | 6/12頁(yè) |
| 文件大?。?/td> | 203K |
| 代理商： | LTC1840 |
LTC1840
6
1840f
BLOCK DIAGRA
t
LOW
t
HIGH
t
su, DAT
t
su, STO
t
su, STA
t
BUF
t
hD, STA
t
hD, DAT
t
hD, STA
t
r
t
f
START
CONDITION
STOP
CONDITION
REPEATED START
CONDITION
START
CONDITION
1840 TD01
SDA
SCL
TIW
W
8-BIT
IDACs
GPI/O
INTERFACE
8-BIT
COUNTER
8-BIT
COUNTER
FAULT
DETECT
REF
OSC
÷
2, 4,
8, 16
15
1
2
3
4
14
5
13
10
11
12
9
7
6
I
DACOUTA
I
DACOUTB
FAULT
BLAST
GPIO1
GPIO2
GPIO3
GPIO4
TACHB
TACHA
SCL
SDA
A1
A0
SERIAL
INTERFACE
1840 BD
8
GND
I
I
PIU
BLAST (Pin 13):
Blast/Timer Function Input. This is a
multifunction digital input pin that controls blast and timer
operation. If this pin is in a logic high state at power-up or
is transitioned from high to low, it will “blast” the current
DAC outputs to full scale (100
μ
A) no matter what their
previous state was and set a fault condition. In addition, if
BLAST is in a logic high state, the serial access timer is
active; this circuit measures time between serial commu-
nications to the LTC1840 and forces a blast and trips a fault
if the part hasn’t been accessed for about 1.5 minutes. This
pin has a 1V logic threshold.
I
DACOUTB
(Pin 14):
Current DAC Output B. This is a high
impedance output with a sinking current output of 0
μ
A to
100
μ
A. This current can be programmed to one of 256
values through the serial interface or it can be “blasted”
immediately to full scale using the BLAST pin or by the
serial access timer if it is enabled and the LTC1840 is not
accessed for about 1.5 minutes. This pin will maintain the
programmed current to a very tight tolerance from as low
as 1.1V to at least 0.75V above V
CC
. The current DAC is
guaranteed to be monotonic over its full 8-bit range.
I
DACOUTA
(Pin 15):
Current DAC Output A. See I
DACOUTB
V
CC
(Pin 16):
Positive Supply. This pin must be closely
decoupled to ground (pin 8). A 10
μ
F tantalum and a 0.1
μ
F
ceramic capacitor in parallel are recommended.
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