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參數(shù)資料
| 型號： | TC815CBUTR |
| 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)： | 3/26頁 |
| 文件大小： | 575K |
| 代理商： | TC815CBUTR |
2005 Microchip Technology Inc.
DS21474C-page 11
TC815
4.0
CONVERSION TIMING
The TC815 analog-to-digital converter uses the con-
ventional dual slope integrating conversion technique
with an added phase that automatically eliminates zero
offset errors. The TC815 gives a zero reading with a
zero volt input.
The TC815 is designed to operate with a 32.768kHz
crystal. The 32kHz crystal is low cost and readily avail-
able; it serves as a time-base oscillator crystal in many
digital clocks. (See External Crystal Sources.)
The external clock is divided by two. The internal clock
frequency is 16.348kHz, giving a clock period of
61.04sec. The total conversion — auto-zero phase,
signal integrate and reference deintegrate — requires
8000 clock periods or 488.3msec. There are approxi-
mately two complete conversions per second.
The integration time is fixed at 1638.5 clock periods or
100msec. This gives rejection of 50/60Hz AC line
noise.
The maximum reference de-integrate time, represent-
ing a full scale analog input, is 3000 clock periods or
183.1msec during manual extended resolution opera-
tion. The 3000 counts are available in Manual mode,
extended resolution operation only. In Auto-Ranging
mode, the maximum de-integrate time is 2000 clock
periods. The 1000 clock periods are added to the auto-
zero phase. An auto-ranging, or manual conversion
takes 8000 clock periods. After a zero crossing is
detected in the Reference De-integrate mode, the auto-
zero phase is entered. Figure 4-1 shows the basic
TC815 timing relationships.
FIGURE 4-1:
BASIC TC815
CONVERSION TIMING
External Crystal = 32.768kHz
Internal Clock Period = TP = 2/32.768 = 61.04sec
Total Conversion Time = TCONV = 8000 (TP)
= 488.3mec
≈ 2 Conv/Sec.
Integration Time = TI = 1638.5 (TP) = 100.0msec.
Maximum Reference De-integration Time =
TDE = 3000 (TP) = 183.1msec
(Manual Extended Resolution)
Minimum Auto-Zero Time
= (8000-3000-1638.5) (TP) = 205.1msec
(Manual, Extended Resolution)
= (8000-2000-1638.5) (TP) = 266.2msec
(Auto-Range)
Auto-Zero
Phase
Min. Auto-Zero
Time
3361.5TP
TI
TDE
To Input
Signal
TCONV 8000 TP
Fixed
1638.5 TP
*Max
3000.0 TP
Extended
Resolution
Zero Crossing
*In Auto-Range Operation
Maximum is 2000TP and
Minimum Auto-Zero time
i s 4361.5TP
Signal
Integrate
Phase
Reference
De-integrate
Phase
Next Conversion
Auto-Zero Cycle
TC815
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