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参数资料
| 型号： | HI7188EVAL |
| 厂商： | Intersil |
| 文件页数： | 10/22页 |
| 文件大小： | 0K |
| 描述： | EVALUATION PLATFORM HI7188 |
| 产品培训模块： | Solutions for Industrial Control Applications |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 16 |
| 采样率（每秒）： | 240 |
| 数据接口： | 串行 |
| 输入范围： | ±2.5 V |
| 在以下条件下的电源（标准）： | 28mW @ 240SPS |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | HI7188 |
| 已供物品： | 板 |
Application Note 9518
Writing the Control Register
Caution should be taken when writing the Control Register via
the Write Menu or Configuration Menu. The least significant
byte contains information regarding the serial interface config-
uration that must be maintained when running the software
provided. To ensure proper functionality of the evaluation soft-
ware, the serial interface must be configured in MSB first
mode, descending byte order and bidirectional I/O pin opera-
tion. This configuration is maintained by writing logic zeros
into the 3 least significant bits of the Control Register.
Invalid Inputs
Entering invalid inputs at some menu prompts will lock up
the software. Generally a CTL-C will return the user to the
DOS prompt.
Software Defaults
Every effort has been made to ease data input when writing
the HI7188 memory elements. Default inputs have been
chosen and the latest input is recorded in memory and used
as the default the next time that prompt is issued. Its impor-
tant to note that the defaults do not necessarily indicate the
current state of the HI7188 or the state of the HI7188 after a
power up reset. If the user is unsure of the current con?gura-
tion of the HI7188, use the display/save current con?guration
menu pick.
Bypassing Calibration
The HI7188 calibration algorithm can be effectively
bypassed by writing all zeros into the Offset Calibration RAM
and 800000 (hex) into the Positive and Negative Full Scale
Calibration RAMs. This causes zero offset and forces a gain
slope factor of 1.0. Please Note: If the calibration algorithm is
bypassed in this manner, the data displayed when reading
the Data RAM will convert the binary output to volts incor-
rectly. Without proper calibration, the HI7188 Evaluation
Software cannot be used to determine accurate voltage as
well as dynamic range and ENOB.
Write Menu Data Entry
When entering data from prompts of the Write Menu the
data must be entered in hex, MSB to LSB format with no
spaces. Error detection is provided for invalid hex digits. A
space or missing hex digit is ?agged as an error and the user
is re-prompted for the data.
Reading the Con?guration Registers
Recall that the Con?guration Register bits associated with
the calibration mode automatically return to normal mode
after calibration is completed. If the user programs a calibra-
tion mode, then completes a read of the Con?guration Menu
(or invokes a display/save current con?guration), the operat-
ing mode bits usually will be in the normal mode due to the
fact that calibration is complete.
Saving Conversion Results to a File
Entering 2 from the Read Menu allows the user to save con-
version results to a file. If the user requests continuous reads
and answers yes to the save to a file prompt, the following
sequence occurs: The user is prompted for the number of
10
conversion readings to save followed by the data format. The
user is then prompted as to whether a header should be
included in the file and is then prompted for the file name in
which the data is saved. If a header is requested, the user is
prompted for a one line comment. The complete header will
include a date stamp line, the current state of the Control Reg-
ister, Configuration Registers and all calibration RAMs as well
as the one line comment. If no header is selected, only the
conversion result data is included in the file.
Choosing the Binary format writes the conversion results, in
binary, for each channel being converted. The ?rst ?eld of
each line is the logical channel number of that conversion
scan, while the second ?eld is the data. The number of data
lines in the ?le is equal to the number of conversions the
user has requested to save times the number of logical
channels being converted.
Choosing the Hex format writes the conversion results, in
hex, for each channel being converted. The ?rst ?eld of each
line is the logical channel number of that conversion scan,
while the second ?eld is the data. The number of data lines
in the ?le is equal to the number of conversions the user has
requested to save times the number of logical channels
being converted.
Choosing the Volts format writes the conversion results, in
volts, for each channel being converted. The ?rst ?eld of
each line is the logical channel number of that conversion
scan, while the second ?eld is the data. The number of data
lines in the ?le is equal to the number of conversions the
user has requested to save times the number of logical
channels being converted. Please note, the conversion to
volts will not be accurate unless accurate calibration coef?-
cients are used by the HI7188.
Choosing the Binary, Hex, Volts format writes the conver-
sion results, in all three formats, for each channel being con-
verted. The ?rst ?eld of each line is the logical channel
number of that conversion scan. The second, third and
fourth ?elds are the data in binary, hex and volts; respec-
tively. The number of data lines in the ?le is equal to the
number of conversions the user has requested to save times
the number of logical channels being converted. Please
note, the conversion to volts will not be accurate unless
accurate calibration coef?cients are used by the HI7188.
Display of Data RAM in Continuous Mode
Entering 2 from the Read Menu allows the user to request
continuous read of the Data RAM. If continuous read mode is
chosen, the user is asked if averaging is required and if so,
how many points to use while maintaining a running average.
If averaging is requested, the following information is dis-
played, per active channel: 1) The binary output stream read
from the HI7188, 2) The binary output stream converted to
hex, 3) The binary output stream converted to volts, 4) The
mean voltage of the last 10 conversion results, 5) The maxi-
mum voltage result, 6) the minimum voltage result, 7) The dif-
ference between the maximum voltage and minimum voltage,
and 8) standard deviation, dynamic range and ENOB, which
is updated in groups of 10 conversions. If averaging is not
requested, only the binary output, binary conversion to hex
and volts is displayed, per active channel:
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相关代理商/技术参数 |
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| HI7188IN | 功能描述:CONV A/D 16BIT 8:1 MUX 44-MQFP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 位数:12 采样率（每秒）:3M 数据接口:- 转换器数目:- 功率耗散（最大）:- 电压电源:- 工作温度:- 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-23-6 包装:带卷 (TR) 输入数目和类型:- |
| HI7188IP | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述:IC 16BIT ADC 7188 DIP40 制造商:Harris Corporation 功能描述: |
| HI7190 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:null24-Bit, High Precision, Sigma Delta A/D Converter |
| HI7190 WAF | 制造商:Harris Corporation 功能描述: |
| HI7190_06 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:24-Bit, High Precision, Sigma Delta A/D Converter |
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