參數(shù)資料
型號: PIC14000T-04I/SS
廠商: Microchip Technology
文件頁數(shù): 117/153頁
文件大小: 0K
描述: IC MCU OTP 4KX14 A/D 28SSOP
標(biāo)準(zhǔn)包裝: 2,100
系列: PIC® 14
核心處理器: PIC
芯體尺寸: 8-位
速度: 4MHz
連通性: I²C
外圍設(shè)備: POR,溫度傳感器,WDT
輸入/輸出數(shù): 20
程序存儲器容量: 7KB(4K x 14)
程序存儲器類型: OTP
RAM 容量: 192 x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 6 V
數(shù)據(jù)轉(zhuǎn)換器: 斜率 A/D
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-SSOP(0.209",5.30mm 寬)
包裝: 帶卷 (TR)
PIC14000
DS40122B-page 66
Preliminary
1996 Microchip Technology Inc.
FIGURE 9-1:
LEVEL-SHIFT NETWORKS
5
A (nominal)
100 k
To A/D mux,
RA1/AN1
SUM
External
Capacitor
(Optional)
(nominal)
*These switches are a matched pair
programmable
LSOFF
(SLPCON<4>)
VDD
Input Protection
Diodes
*
RD5/AN5
RA1/AN1 only
*
LSOFF
(SLPCON<4>)
ADZERO
(ADCON<0>)
reference
comparators
VDD
9.3
Slope Reference Voltage Divider
The slope reference voltage divider circuit, consisting
of a buffer amplier 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 rmware can measure the SREFHI and SREFLO
voltages, and in conjunction with the KREF and KBG cal-
ibration data correct for the A/D's offset and slope
errors. See AN624 for further details.
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
°C and its temperature coef-
cient is approximately 3.7mV/
°C. The sensor voltage
at 25
°C and the temperature coefcient 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.
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