參數(shù)資料
型號: PIC14000-04
廠商: Microchip Technology Inc.
英文描述: 28-Pin Programmable Mixed Signal Controller
中文描述: 28引腳可編程混合信號控制器
文件頁數(shù): 66/152頁
文件大小: 953K
代理商: PIC14000-04
PIC14000
DS40122B-page 66
Preliminary
1996 Microchip Technology Inc.
FIGURE 9-1:
LEVEL-SHIFT NETWORKS
5
μ
A (nominal)
100 k
(nominal)
To A/D mux,
programmable
reference
comparators
RA1/AN1
SUM
External
Capacitor
(Optional)
*These switches are a matched pair
LSOFF
(SLPCON<4>)
V
DD
Input Protection
Diodes
*
RD5/AN5
RA1/AN1 only
*
LSOFF
(SLPCON<4>)
ADZERO
(ADCON<0>)
V
DD
9.3
Slope Reference Voltage Divider
The slope reference voltage divider circuit, consisting
of a buffer amplifier and resistor divider, is connected to
the internal bandgap reference producing two other
voltage references called SREFHI and SREFLO (see
Figure 9-2). SREFHI is nominally the same as the
bandgap voltage, 1.2V, and SREFLO is nominally
0.13V. These reference voltages are available on two
of the analog multiplexer channels. The A/D module
and firmware can measure the SREFHI and SREFLO
voltages, and in conjunction with the K
ibration data correct for the A/D's offset and slope
errors. See AN624 for further details.
REF
and K
BG
cal-
9.4
Internal Temperature Sensor
The internal temperature sensor is connected to the
channel 7 input of the A/D converter. The sensor volt-
age is 1.05V nominal at 25
°
ficient is approximately 3.7mV/
at 25
°
C and the temperature coefficient values are
stored in the calibration space EPROM (See
Table 4-2). To enable the temperature sensor, the
TEMPOFF bit (SLPCON<1>) must be cleared.
C and its temperature coef-
°
C. The sensor voltage
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