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參數(shù)資料
| 型號： | TC826CBU713 |
| 元件分類： | ADC |
| 英文描述： | 1-CH DUAL-SLOPE ADC, PQFP64 |
| 封裝： | PLASTIC, QFP-64 |
| 文件頁數(shù)： | 5/18頁 |
| 文件大小： | 348K |
| 代理商： | TC826CBU713 |
2005 Microchip Technology Inc.
DS21477C-page 13
TC826
4.14
BAR Format
The TC826 powers up in the BAR mode. BAR/DOT is
pulled high internally. This display format is similar to a
thermometer display. All bars/LCD segments including
zero, below the bar/LCD segment equaling the input
signal level, are on. A half scale input signal, for exam-
ple, would be displayed with BAR 0 to BAR 20 on.
4.15
DOT Format
By connecting BAR/DOT to VSS through a 1MΩ resis-
tor, the DOT mode is selected. Only the BAR LCD seg-
ment equaling the input signal is on. The zero segment
is on for zero input.
This mode is useful for moving cursor or ‘needle’ appli-
cations.
4.16
LCD Displays
Most end products will use a custom LCD display for
final production. Custom LCD displays are low cost and
available from all manufacturers. The TC826 interfaces
to non-multiplexed LCD displays. A backplane driver is
included on-chip.
To speed initial evaluation and prototype work, a stan-
dard TC826 LCD display is available from Varitronix.
Varitronix Ltd. LCDs
4/F Liven House
61-63 King Yip Street
Kwun Tong, Kowloon
Hong Kong
Tel: (852)2389-4317
Fax: (852)2343-9555
USA Office:
VL Electronics / Varitronix
3250 Wilshire Blvd., Suite 901
Los Angeles, CA 90010
Tel: (213) 738-8700
Fax: (213) 738-5340
Part No.: VBG-413-DP
Other standard LCD displays suitable for development
work are available in both linear and circular formats.
One manufacturer is:
UCE Inc.
24 Fitch Street
Norwalk, CT 06855
Tel: 203/838-7509
Part No. 5040: 50 segment circular display with
3-digit numeric scale.
Part No. 5020: 50 segment linear display.
4.17
LCD Backplane Driver (BP, Pin 15)
Additional drive electronics are not required to interface
the TC826 to an LCD display. The TC826 has an on-
chip backplane generator and driver. The backplane
frequency is:
FBP = FOSC
Figure 4-8 gives typical backplane driver rise/fall time
versus backplane capacitance.
FIGURE 4-8:
BACKPLANE DRIVE RISE/
FALL TIME VS.
CAPACITANCE
4.18
Flat Package Socket
Sockets suitable for prototype work are available. A
USA source is:
Nepenthe Distribution
2471 East Bayshore, Suite 520
Palo Alto, CA 94303
Tel: 415/856-9332
Telex: 910/373-2060
‘BQ’ Socket Part No.: IC51-064-042 BQ
10
9
8
7
6
5
4
3
2
1
0
1234
56780 10
Backplane Capacitance (X 100pf)
Rise/Fall
Time
(X
100ns)
TA = 25°C
VS = 9V
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