参数资料
型号: C8051F226R
厂商: Silicon Laboratories Inc
文件页数: 73/146页
文件大小: 0K
描述: IC 8051 MCU 8K FLASH 48TQFP
标准包装: 1
系列: C8051F2xx
核心处理器: 8051
芯体尺寸: 8-位
速度: 25MHz
连通性: SPI,UART/USART
外围设备: 欠压检测/复位,POR,WDT
输入/输出数: 32
程序存储器容量: 8KB(8K x 8)
程序存储器类型: 闪存
RAM 容量: 1.25K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 3.6 V
数据转换器: A/D 32x8b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 48-TQFP
包装: 剪切带 (CT)
其它名称: 336-1010-1
C8051F2xx
32
Rev. 1.6
5.
ADC (8-Bit, C8051F220/1/6 Only)
Description
The ADC subsystem for the C8051F220/1/6 consists of configurable analog multiplexer (AMUX), a pro-
grammable gain amplifier (PGA), and a 100ksps, 8-bit successive-approximation-register ADC with inte-
grated track-and-hold and programmable window detector (see Figure 5.1).
The AMUX, PGA, Data
Conversion Modes, and Window Detector are all configurable under software control via the Special Func-
tion Register's shown in Figure 5.1. The ADC subsystem (ADC, track-and-hold and PGA) is enabled only
when the ADCEN bit in the ADC Control register (ADC0CN, SFR Definition 5.3) is set to 1. The ADC sub-
system is in low power shutdown when this bit is 0.
Figure 5.1. 8-Bit ADC Functional Block Diagram
5.1.
Analog Multiplexer and PGA
Any external port pin (ports 0-3) may be selected via software. The AMX0SL SFR is used to select the
desired analog input pin. (See SFR Definition 5.1). When the AMUX is enabled, the user selects which
port is to be used (bits PRTSL0-1), and then the pin in the selected port (bits PINSL0-2) to be the analog
input.
The table in ?? shows AMUX functionality by channel for each possible configuration. The PGA amplifies
the AMUX output signal by an amount determined by the states of the AMPGN2-0 bits in the ADC Config-
uration register, ADC0CF (SFR Definition 5.2). The PGA can be software-programmed for gains of 0.5, 1,
2, 4, 8 or 16. It defaults to a gain of 1 on reset.
8-Bit
SAR
ADC
RE
F
+
-
VDD
8
32-to-1
AMUX
VDD
ADCEN
S
YSC
L
K
X
AIN0
AIN31
ADBUSY(w)
C
onve
rsi
on
S
tar
t
AMX0SL
PI
N
S
L0
PI
N
S
L1
PI
N
S
L2
PRT
SL
0
ADC0CF
AMPGN0
AMPGN1
AMPGN2
A
D
CS
C0
A
D
CS
C1
A
D
CS
C2
ADC0CN
AD
L
J
ST
AD
W
IN
T
ADS
T
M
0
ADS
T
M
1
AD
BU
S
Y
A
DCI
NT
ADC
T
M
A
DCE
N
A
DC0
H
AM
X
EN
PRT
SL
1
VDD
VREF
GND
T2 OV
..
.
ADC0LTH
ADC0GTH
16
8
ADWINT
AIN0-31 are port 0-3
pins -- any external
port pin may be configured as an
analog input
GND
Dig
Comp
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