- 您現在的位置：買賣IC網 > PDF目錄383935 > TC815CBU (Microchip Technology Inc.) 3-1/2 Digit Auto-Ranging A/D Converter with Triplex LCD Drive and Display Hold Function PDF資料下載
參數資料
| 型號： | TC815CBU |
| 廠商： | Microchip Technology Inc. |
| 元件分類： | 顯示驅動器 |
| 英文描述： | 3-1/2 Digit Auto-Ranging A/D Converter with Triplex LCD Drive and Display Hold Function |
| 中文描述： | 3-1/2數字自動測距的A / D三層液晶顯示驅動器和轉換器保持功能 |
| 文件頁數： | 14/26頁 |
| 文件大?。?/td> | 595K |
| 代理商： | TC815CBU |
TC815
DS21474B-page 14
2002 Microchip Technology Inc.
6.0
-MEM OPERATING MODE
Bringing -MEM (Pin 61) momentarily low configures the
TC815 “-MEM” Operating mode. The -MEM LCD
Annunciator becomes active. In this Operating mode,
subsequent measurements are made relative to the last
two digits (-99) displayed at the time MEM is low. This
represents 5% of full scale. The last two significant digits
are stored and subtracted from all the following input
conversions. The following examples clarify operation:
EXAMPLE 6-1:
R
I
(N) = 18.21k
(20k
Range) = > Display 18.21k
MEM
= > Store 0.21k
IN AUTO-RANGING
EXAMPLE 6-2:
IN FIXED RANGE
(200.0
FULL SCALE)
EXAMPLE 6-3:
V
I
(N) = 0.51V = > Display 0.51V
MEM
= > Store 0.51V
IN FIXED RANGE
On power-up, the TC815 “-MEM” mode is not active.
Once the “-MEM” is entered, bringing MEM low again,
it returns the TC815 to normal operation.
The “-MEM” mode is also cancelled whenever the mea-
surement type (resistance, voltage, current AC/DC,
/LO
) or range is changed. The LCD -MEM annunci-
ator will be off in normal operation.
In the auto-range operation, if the following input signal
cannot be converted on the same range as the stored
value, the “-MEM” mode is cancelled. The LCD annun-
ciator is turned off.
The “-MEM” Operating mode can be very useful in
resistance measurements when lead length resistance
would cause measurement errors.
7.0
AUTOMATIC RANGE
SELECTION OPERATION
When power is first applied, the TC815 enters the auto-
range operating state. The Auto-Range mode may be
entered from Manual mode by changing the measure-
ment function (resistance or voltage), or by changing
the measurement option (AD/DC,
/LO
).
The automatic voltage range selection begins on the
most sensitive scale first: 200mV for DC or 2.000V for
AC measurements. The voltage range selection flow
chart is given in Figure 7-1.
Internal input protection diodes to V
DD
(Pin 28) and
V
SSA
(Pin 57) clamp the input voltage. The external
10M
input resistance (see Figure 7-1, R14 and R13)
limits current safely in an overrange condition.
The voltage range selection is designed to maximize
resolution. For input signals less than 9% of full scale
(count reading <180), the next most sensitive range is
selected.
An over range voltage input condition is flagged when-
ever the internal count exceeds 2000, by activating the
buzzer output (Pin 4). This 4kHz signal can directly
drive a piezo electric acoustic transducer. An out of
range input signal causes the 4kHz signal to be on
122msec, off for 122 msec, on for 122msec and off for
610msec (see Figure 11-1).
During voltage auto-range operation, the extended res-
olution feature operates on the 2000V range only. (See
Extended Resolution Operating mode discussion.)
The resistance automatic range selection procedure is
shown in Figure 7-2. The 200
range is the first range
selected unless the TC815 low ohms resistance mea-
surement option is selected. In low ohms operation, the
first full scale range tried is 2k
.
The resistance range selected maximizes sensitivity. If
the conversion results in a reading less than 180, the
next most sensitive full scale range is tried.
If the conversion is less than 19 in auto-range opera-
tion, a continuous 4kHz signal is output at BUZ (Pin 4).
An over range input does not activate the buzzer.
Out of range input conditions are displayed by a blink-
ing most significant digit with the three least significant
digits set to “000.”
The extended resolution feature operates only on the
2000k
and 2000V full scale range during auto-range
operation. A blinking “1” most significant digit is inter-
preted as the digit 2. The three least significant digits
display data normally.
R
I
(N+1) = 19.87k
(20k
Range)
= > Display 19.87 - 0.21 = 19.66k
R
I
(N+2) = 22.65k
(200k
Range)
= > Display 22.7k
and MEM disappears
R
I
(N) = 18.21k
= > Display 18.2k
MEM
= > Store 8.2
R
I
(N+1) = 36.7
= > Display 36.7 - 8.2 = 28.5
R
I
(N+2) = 5.8
= > Display 5.8 = 2.4
*
*Will display minus resistance if following input is
less than offset stored at fixed range.
V
I
(N+1) = 3.68V
= > Display 3.68 - 0.51 = 3.17V
V
I
(N+2) = 0.23V
= > Display 0.23 - 0.51 = -0.28V
V
I
(N+3) = -5.21V
= > Display - 5.21 - 0.51 = -5.72V
相關PDF資料 |
PDF描述 |
|---|---|
| TC818A | Auto-Ranging Analog-to-Digital Converter with 3-1/2 Digit Display |
| TC818 | Auto-Ranging Analog-to-Digital Converter with 3-1/2 Digit Display |
| TC818ACBU | Auto-Ranging Analog-to-Digital Converter with 3-1/2 Digit Display |
| TCA7660 | HIGH FREQUENCY 7660 DC-TO-DC VOLTAGE CONVERTER |
| TCA785 | Phase Control IC |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TC-815-SC | 制造商:Thomas & Betts 功能描述: |
| TC815-TB | 制造商:Thomas & Betts 功能描述:CABLE TIE .8X1" IN-LINE SCREW MT-#1 制造商:Thomas & Betts 功能描述:CABLE TIES |
| TC817 | 制造商:THOMAS & BETTS 功能描述: |
| TC8-17S243.3R | 制造商:TRUMPOWER 制造商全稱:Tumbler Technologies + TRUMPower 功能描述:DC/DC CONVERTERS 2:1 Input, 12.5 to 20 Watt |
| TC8-17S483.3R | 制造商:TRUMPOWER 制造商全稱:Tumbler Technologies + TRUMPower 功能描述:DC/DC CONVERTERS 2:1 Input, 12.5 to 20 Watt |
發(fā)布緊急采購，3分鐘左右您將得到回復。