参数资料
型号: 101-1028
厂商: Rabbit Semiconductor
文件页数: 115/172页
文件大小: 0K
描述: MODULE RABBITCORE RCM3750
标准包装: 1
系列: RabbitCore®
模块/板类型: MPU 核心模块
适用于相关产品: RCM3750
User’s Manual
41
Reads the voltage of an analog input channel by serial-clocking an 8-bit command to the ADS7870 A/D
converter by the Direct Mode method. This function assumes that Mode1 (most significant byte first) and
the A/D converter oscillator have been enabled. See anaInConfig() for the setup.
The conversion begins immediately after the last data bit has been transferred. An exception error will
occur if Direct Mode bit D7 is not set.
PARAMETERS
cmd
contains a gain code and a channel code as follows.
D7—1; D6–D4—Gain Code; D3–D0—Channel Code
Use the following calculation and the tables below to determine cmd:
cmd = 0x80 | (gain_code*16) + channel_code
len
, the output bit length, is always 12 for 11-bit conversions
RETURN VALUE
unsigned int anaInDriver(unsigned int cmd,
unsigned int len);
Gain Code
Multiplier
0x1
1x2
2x4
3x5
4x8
5
x10
6
x16
7
x20
Channel Code
Differential Input
Lines
Channel Code
Single-Ended
Input Lines*
* Negative input is ground.
4–20 mA
Lines
0
+AIN0 -AIN1
8
AIN0
1
+AIN2 -AIN3
9
AIN1
2
+AIN4 -AIN5
10
AIN2
3
Not accessible on RCM3700 Prototyping Board
+AIN6 -AIN7
11
AIN3
4
-AIN0 +AIN1
12
AIN4
5
-AIN2 +AIN3
13
AIN5
6
-AIN4 +AIN5
14
AIN6
-AIN6 +AIN7
15
AIN7
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