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參數(shù)資料
| 型號： | TLV340x |
| 英文描述： | Nanopower, 1.8V, SOT23 Comparator with Voltage Reference |
| 中文描述： | Nanopower，電壓為1.8V，SOT23封裝的電壓基準比較 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大?。?/td> | 236K |
| 代理商： | TLV340X |
TLV3011, TLV3012
SBOS300B
9
www.ti.com
FIGURE 4. The TLV3011 or TLV3012 Configured as a
Power Up Reset Circuit for the MSP430.
POWER-ON RESET
The reset circuit shown in Figure 4 provides a time delayed
release of reset to the MSP430 microcontroller. Operation of
the circuit is based on a stabilization time constant of the
supply voltage, rather than on a predetermined voltage
value. The negative input is a reference voltage created by
the internal voltage reference. The positive input is an RC
circuit that provides a power-up delay. When power is ap-
plied, the output of the comparator is low, holding the
processor in the reset condition. Only after allowing time for
the supply voltage to stabilize does the positive input of the
comparator become higher than the negative input, resulting
in a high output state, releasing the processor for operation.
The stabilization time required for the supply voltage is
adjustable by the selection of the RC component values. Use
of a lower-valued resistor in this portion of the circuit will not
increase current consumption because no current flows
through the RC circuit after the supply has stabilized.
FIGURE 5. TLV3012 Configured as a Relaxation Oscillator.
V+
TLV301x
C
10nF
DI
R
1
1M
R
PULL-UP(1)
10k
RESET
MSP430
1.242V
REF
NOTE: (1) Use R
PULL-UP
with the TLV3011 only.
The reset delay needed depends on the power-up character-
istics of the system power supply. R
1
and C
1
are selected to
allow enough time for the power supply to stabilize. D
1
provides rapid reset if power is lost. In this example, the
R
1
C
1
time constant is 10mS.
RELAXATION OSCILLATOR
The TLV3012 can be configured as a relaxation oscillator as
in Figure 5 to provide a simple and inexpensive clock output.
The capacitor is charged at a rate of T = 0.69RC. It also
discharges at a rate of 0.69RC. Therefore, the period is
T = 1.38RC. R
1
may be a different value than R
2
.
V+
F
= 724Hz
V+
2/3 (V+)
1/3 (V+)
R
2
1M
R
1
1M
R
2
1M
R
2
1M
V
OUT
V
C
V+
t
C
1000pF
T
1
T
2
t
TLV3012
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