- 您现在的位置：买卖IC网 > PDF目录98181 > TC820CKWTR 1-CH DUAL-SLOPE ADC, PQFP44 PDF资料下载
参数资料
| 型号： | TC820CKWTR |
| 元件分类： | ADC |
| 英文描述： | 1-CH DUAL-SLOPE ADC, PQFP44 |
| 封装： | PLASTIC, QFP-44 |
| 文件页数： | 7/28页 |
| 文件大小： | 616K |
| 代理商： | TC820CKWTR |
第1页第2页第3页第4页第5页第6页当前第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
2002 Microchip Technology Inc.
DS21476B-page 15
TC820
4.0
FUNCTION CONTROL INPUTS
PIN
4.1
Functional Description
The TC820 Operating modes are selected with the
function control inputs. See the control input truth,
Table 4-1. The high logic threshold is
≥ VDD –1.5V and
the low logic level is
≤ DGND +1.5V.
TABLE 4-1:
TC820 CONTROL INPUT
TRUTH TABLE
Note
1:
Logic "0" = DGND
2:
Logic "1" = VDD-
4.1.1
FREQ/VOLTS
This input determines whether the TC820 is in the Ana-
log-to-Digital Conversion mode, or in the Frequency
Counter mode. When FREQ/VOLTS is connected to
VDD, the TC820 will measure frequency at the RANGE/
FREQ input. When unconnected, or connected to
DGND, the TC820 will operate as an analog-to-digital
converter. This input has an internal 5
A pull-down to
DGND.
4.1.2
LOGIC
The LOGIC input is used to activate the logic probe
function. When connected to VDD, the TC820 will enter
the Logic Probe mode. The LCD will show "OL" and all
decimal points will be off. The decimal point inputs
directly control "high" and "low" display annunciators.
When LOGIC is unconnected, or connected to DGND,
the TC820 will perform analog-to-digital or frequency
measurements, as selected by the FREQ/VOLTS
input. The LOGIC input has an internal 5
A pull-down
to DGND.
4.1.3
RANGE/FREQ
The function of this dual purpose pin is determined by
the FREQ/VOLTS input. When FREQ/VOLTS is con-
nectedtoVDD, RANGE/FREQ is the input for the fre-
quency counter function. Pulses at this input are
counted with a time-base equal to FOSC/40,000. Since
this input has CMOS input levels (VDD –1.5Vand
DGND +1.5V), an external buffer is recommended.
When the TC820 analog-to-digital converter function is
selected, connecting RANGE/FREQ to VDD will divide
the integration time by 10. Therefore, the RANGE/
FREQ input can be used to perform a 10:1 range
change without changing external components.
4.1.4
DP0/LO, DP1/HI
The function of these dual purpose pins is determined
by the LOGIC input. When the TC820 is in the Analog-
to-Digital Converter mode, these inputs control the
LCD decimal points. See the decimal point truth,
Table 4-2. These inputs have internal 5
A pull-downs
to DGND when the Voltage/Frequency Measurement
mode is active.
Connecting the LOGIC input to VDD places the TC820
in the Logic Probe mode. In this mode, the DP0/LO and
DP1/HI inputs control the LCD "low" and "high" annun-
ciators directly. When DP1/HI is connected to VDD,the
"high" annunciator will turn on. When DP0/LO is con-
nectedtoVDD, the "low" annunciator and the buzzer
will turn on. The internal pull-downs on these pins are
disabled when the logic probe function is selected.
These inputs have CMOS logic switching thresholds.
For optimum performance as a logic probe, external
level shifters are recommended. See the applications
section for details.
4.1.5
BUZIN
This input controls the TC820 on-chip buzzer driver.
Connecting BUZIN to VDD will turn the buzzer on.
There is an external pull-down to DGND. BUZIN can be
used with external circuitry to provide additional func-
tions, such as a fast, audible continuity indication.
4.2
Additional Features
The TC820 is available in 40-pin and 44-pin packages.
Several additional features are available in the 44-pin
package.
Logic Input
TC820 Function
FREQ/
VOLTS
RANGE/
FREQ
LOGIC
X
1
Logic Probe
0
A/D Converter,
VFULL SCALE =2x VREF
0
1
0
A/D Converter,
VFULL SCALE =20 x VREF
1
Frequency
Counter
Input
0
Frequency Counter
TABLE 4-2:
TC820 DECIMAL POINT
TRUTH TABLE
DP1
DP0
LCD
0
3999
0
1
399.9
10
39.99
11
3.999
相关PDF资料 |
PDF描述 |
|---|---|
| TC820CLWTR | 1-CH DUAL-SLOPE ADC, PQCC44 |
| TC820CKW | 1-CH DUAL-SLOPE ADC, PQFP44 |
| TC820CLW | 1-CH DUAL-SLOPE ADC, PQCC44 |
| TC820CPL | 1-CH DUAL-SLOPE ADC, PDIP40 |
| TC820CLW | DUAL-SLOPE ADC, PARALLEL ACCESS, PQCC44 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TC820CLW | 功能描述:LCD 驱动器 3-3/4 A/D Converter RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TC820CLW713 | 功能描述:LCD 驱动器 3-3/4 A/D Converter RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TC820CPL | 功能描述:LCD 驱动器 3-3/4 A/D Converter RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TC8-20S2405R | 制造商:TRUMPOWER 制造商全称:Tumbler Technologies + TRUMPower 功能描述:DC/DC CONVERTERS 2:1 Input, 12.5 to 20 Watt |
| TC8-20S4805R | 制造商:TRUMPOWER 制造商全称:Tumbler Technologies + TRUMPower 功能描述:DC/DC CONVERTERS 2:1 Input, 12.5 to 20 Watt |
发布紧急采购，3分钟左右您将得到回复。