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參數(shù)資料
| 型號(hào)： | G681 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Tantalum Molded Capacitor; Capacitance: 1.5uF; Voltage: 16V; Case Size: 3.2x1.6 mm; Packaging: Tape & Reel |
| 中文描述： | 微處理器復(fù)位IC |
| 文件頁數(shù)： | 6/7頁 |
| 文件大小： | 101K |
| 代理商： | G681 |
Ver: 03 Preliminary
Jan 25 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
6
G680/G681
Global Mixed-mode Technology Inc.
A value such as 1M
for R
TOTAL
is a reasonable value
because it draws minimum battery current but has no
measurable effect on accuracy.
When working with large resistors, a small amount of
leakage current can cause voltage offsets that
degrade system accuracy.
The maximum recommended total resistance from
V
BAT
to ground is 3M
.
Figure 2. Example Circuit
Once the desired trip points are determined, set the
V
BAT(hi)
threshold first.
For example, use a total of 1M = R1 + R2 + R3. For a
typical single-cell lithium ion battery, 3.6V is a good
“high threshold” because at 3.6V the battery is moder-
ately charged. Solving for R3:
1M
R3
V
BAT (hi)
= 1.245
R3 = 344k
Once R3 is determined, the equation for V
BAT (lo)
can
be used to determine R2. A single lithium-ion cell
should not be discharged below 2.5V. Many applica-
tions limit the drain to 3.1V. Using 3.1V for the V
BAT (lo)
threshold allows calculation of the two remaining re-
sistor values.
1M
R2+344k
V
BAT (lo)
=3.1V = 1.245
R2 = 56k
R1 = 1M
- R2 - R3
R 1=600k
The accuracy of the resistors can be chosen based
upon the accuracy required by the system.
Figure 3. Interfacing to μPs with Bidirectional Re-
set
I/O
Interfacing to μPs with Bidirectional Reset Pins
Since the RESET output on the G681L is open drain,
this device interfaces easily with μPs that have bidi-
rectional reset pins, such as the Motorola 68HC11.
Connecting the μP supervisor’s RESET output di-
rectly to the microcontroller’s (μC’s) RESET pin with
a single pull-up resistor allows either device to assert
reset (Figure 3).
.
V
BATT
VCC
LTH
HTH
RESET
R1
R2
R3
1%
1%
1%
G680/G681
RESET
604k
56k
340k
INPUT
GND
μP
V
CC
RESET
GND
G681
V
CC
V
CC
68HCXX
R
PULL-UP
RESET
MOTOROLA
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