參數(shù)資料
型號(hào)： NS32FX100VF
廠商： National Semiconductor Corporation
英文描述： System Controller
中文描述： 系統(tǒng)控制器
文件頁(yè)數(shù)： 53/94頁(yè)
文件大?。?/td> 955K
代理商： NS32FX100VF
3.0 System Interface
3.1 POWER AND GROUNDING
The NS32FX100 requires a 5V
g
10% supply to nine digital
pins and a 5V
g
5% supply to two analog pins. Two pins
provide analog ground, nine pins provide digital ground.
3.2 CLOCKS AND TRAPS CONNECTIVITY
TL/EE/11331–33
TL/EE/11331–34
FIGURE 3-2. Oscillator Circuits
TABLE 3-1. R, C and L Values
Frequency
R1
R2
C1
(pF) (pF)
C2
C3
(pF)
L
m
H
32.768 kHz
10 M
X
1 M
X
27
27
455 kHz (ceramic)
1 M
X
4.7 k
X
22
100
29.49–31.95 MHz 180 k
X
51
X
22
22
39.32–41.79 MHz 150 k
X
51
X
22
22
1000 1.8
49.15 MHz
150 k
X
51
X
22
22
1000 1.1
3.3 CONTROL OF POWER CONSUMPTION
An NS32FX100-based FAX-system controller is always in
one of three modes:
1. Normal mode during a FAX transaction.
2. Power Save mode between FAX transactions. Power
can be saved by running at a lower frequency and dis-
abling unused modules.
In order to run at a lower frequency (the Normal mode
frequency divided by 16), bit 4 of the CSCL register
should be set to ‘‘1’’. Due to clock synchronization de-
lays, up to 80
m
s may elapse between setting this bit and
the actual change in running frequency.
3. Freeze mode, when the main power supply is turned off.
A back-up battery is used to operate the NS32FX100
time keeper and, optionally, to maintain critical portions
of the memory.
The following table summarizes the operation modes and
their power consumption:
TABLE 3-2. System Chip Operation
Modes and Power Consumption
Operation Mode
Current
ETC
DRAM
Refresh
*
Consumption
Normal Mode
Power Save Mode
@
E
1 MHz
Freeze Mode
Freeze Mode (32 kHz)
k
200 mA
k
16 mA
k
1 mA
k
0.1 mA
a
a
a
a
a
a
a
b
(5V)
(3V)
*
NS32FX200, NS32FV100 only.
TL/EE/11331–32
FIGURE 3-1. Power and Ground Connections
53
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