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參數(shù)資料
| 型號： | 83F5885MIC2505BM |
| 英文描述： | IC-SM-HIGH-SIDE SWITCH |
| 中文描述： | 集成電路釤高邊開關(guān) |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 127K |
| 代理商： | 83F5885MIC2505BM |
December 1997
10-7
MIC1555/1557
Functional Diagrams
Micrel
10
Functional Description
Refer to the block diagrams.
The MIC1555/7 provides the logic for creating simple RC
timer or oscillator circuits.
The MIC1555 has separate THR (threshold) and TRG
(trigger) connections for monostable (one-shot) or astable
(oscillator) operation.
The MIC1557 has a single T/T (threshold and trigger) con-
nection for astable (oscillator) operation only. The MIC1557
includes a CS (chip select/reset) control.
Supply
VS (supply) is rated for +2.7V to +18V. An external capacitor
is recommended to decouple noise.
Resistive Divider
The resistive voltage divider is constructed of three equal
value resistors to produce
1
3
V
S
and
2
3
V
S
voltage for trigger
and threshold reference voltages.
Chip Select/Reset (MIC1557 only)
CS (chip select/reset) controls the bias supply to the oscillator’s
internal circuitry. CS must be connected to logic high or logic
low. Floating CS will result in unpredictable operation. When
the chip is deselected, the supply current is less than 1
μ
A.
Forcing CS low resets the MIC1557 by setting the flip flop,
forcing the output low.
Threshold Comparator
The threshold comparator is connected to S (set) on the RS
flip-flop. When the threshold voltage (
2
3
V
S
) is reached, the
flip-flop is set, making the output low. THR is dominant over
TRG.
S
R
Q
T/T
OUT
VS
Bias
GND
CS
V
SUPPLY
MIC1557
Output
1k
0.1μF
8kHz
1M
MIC1557 Block Diagram with External Components
(Astable Configuration)
S
R
Q
OUT
GND
Output
TRG
THR
Trigger
VS
V
SUPPLY
MIC1555
1k
0.1μF
<100μs
Bias
100μs
MIC1555 Block Diagram with External Components
(Monostable Configuration)
Trigger Comparator
The trigger comparator is connected to R (reset) on the RS
flip-flop. When TRG (trigger) goes below the trigger voltage
(
1
3
V
S
Flip-Flop and Output
A reset signal causes Q to go low, turning on the P-channel
MOSFET and turning off the N-channel MOSFET. This
makes the output rise to nearly V
S
.
A set signal causes Q to go high, turning off the P-channel
MOSFET, and turning on the N-channel MOSFET, grounding
OUT.
Basic Monostable Operation
Refer to the MIC1555 functional diagram.
A momentary low signal applied to TRG causes the output to
go high. The external capacitor charges slowly through the
external resistor. When V
THR
(threshold voltage) reaches
2
3
V
S
, the output is switched off, discharging the capacitor.
During power-on, a single pulse may be generated.
Basic Astable Operation
Refer to the MIC1557 functional diagram.
The MIC1557 starts with T/T low, causing the output to go
high. The external capacitor charges slowly through the
external resistor. When V
T/T
reaches
2
3
V
S
(threshold volt-
age), the output is switched off, slowly discharging the
capacitor. When V
T/T
decreases to
1
3
V
S
(trigger voltage), the
output is switched on, causing V
T/T
to rise again, repeating
the cycle.
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