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參數(shù)資料
| 型號(hào)： | MC13xx |
| 廠商： | Motorola, Inc. |
| 英文描述： | CONVERTER, DC/DC, 1O/P, 5W, 3.3V; Power rating:5W; DC/DC Converter O/P type:Single; Voltage, input max:36V; Voltage, input min:9V; Voltage, output:3.3V; Depth, external:10.2mm; Length / Height, external:31.8mm; Width, RoHS Compliant: Yes |
| 中文描述： | 通用窄帶調(diào)頻接收器集成電路 |
| 文件頁數(shù)： | 54/68頁 |
| 文件大小： | 1316K |
| 代理商： | MC13XX |
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MC13110A/B MC13111A/B
54
MOTOROLA ANALOG IC DEVICE DATA
Clock Divider/Voltage Adjust Register
This register controls the divider value for the
programmable switched capacitor filter clock divider, the low
battery detect threshold select, the voltage reference adjust,
and the scrambler bypass mode (MC13110A/B only).
Operation is explained in Figures 127 through 134. The Tx
and Rx Audio bits are don’t cares for either the MC13111A or
the MC13111B device. However, for the MC13110A/B, these
bits are defined. Figure 129 describes the operation. Note the
power–up default bit is set to <0>, which is the scrambler
bypass mode.
Low Battery Detect
The low battery detect circuit can be operated in
programmable and non–programmable threshold modes.
The non–programmable threshold mode is only available in
the 52 QFP package. In this mode, there are two low battery
detect comparators and the threshold values are set by
external resistor dividers which are connected to the REF1
and REF2 pins. In the programmable threshold mode,
several different threshold levels may be selected through
the “Low Battery Detect Threshold Register” as shown in Figure
128. The power–on default value for this register is <0,0,0> and
is the non–programmable mode. Figure 130 shows equivalent
schematics for the programmable and non–programmable
operating modes.
Figure 127. Clock Divider/Voltage Adjust Latch Bits
0
0
6–b Switched
Capacitor Filter Clock Counter Latch
4–b Voltage
Reference Adjust
3–b Low Battery
Detect Threshold Select
0
MSB
MSB
LSB
LSB
(MC13111A/B)
Tx Sbl
Rx Sbl
6–b Switched
Capacitor Filter Clock Counter Latch
4–b Voltage
Reference Adjust
3–b Low Battery
Detect Threshold Select
0
MSB
MSB
LSB
LSB
(MC13110A/B)
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Figure 128. Low Battery Detect Threshold Selection
Threshold
Select Bit #2
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Low Battery
Detect
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Threshold
Select Bit #1
0
Low Battery
Detect
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Threshold
Select Bit #0
0
Low Battery
Detect
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Select #
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0
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Operating Mode
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Non–Programmable
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Battery Detect
Threshold Value (V)
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N/A
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0
0
0
1
1
Programmable
2.850
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0
1
0
2
Programmable
2.938
0
1
1
3
Programmable
3.025
1
0
0
4
Programmable
3.200
1
0
1
5
Programmable
3.288
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Figure 129. MC13110A/B Bypass Mode Bit Description
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Bypass
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0
1
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Normal Operation with Tx Scrambler
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Bypass
Rx Scrambler
0
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Normal Operation Rx Scrambler
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