參數(shù)資料
型號(hào)： AD7877ACP-500RL7
廠商： ANALOG DEVICES INC
元件分類： 消費(fèi)家電
英文描述： Touch Screen Controller
中文描述： SPECIALTY CONSUMER CIRCUIT, QCC32
封裝： 5 X 5 MM, MO-220VHHD-2, LFCSP-32
文件頁數(shù)： 19/44頁
文件大小： 1002K
代理商： AD7877ACP-500RL7
AD7877
AUXILIARY INPUTS
The AD7877 has three auxiliary analog inputs, AUX1 to AUX3.
These channels have a full-scale input range from 0 V to V
REF
.
The ADC channel addresses for AUX1 to AUX3 are 0011b,
0100b, and 0101b, and the results are stored in Registers 10011b,
10100b, and 10101b. These pins can also be reconfigured as
general-purpose logic inputs/outputs, as described in the GPIO
Configuration section.
Rev. A | Page 19 of 44
LIMIT COMPARISON
The AUX1 measurement, the two battery measurements, and
the TEMP1 measurement can all be compared with high and
low limits, and an out-of-limit result made to generate an alarm
output at the ALERT pin. The limits are stored in registers with
addresses from 00100b to 01011b. After a measurement from
any one of the four channels is converted, it is compared with
the corresponding high and low limits. An out-of-limit result
sets one of the status bits in the alert status/enable register. For
details on these and other registers, see the Register Maps and
Detailed Register Descriptions sections. For details on writing
and reading data, see the Serial Interface section.
As mentioned previously, the temperature comparison is made
using the result of the TEMP1 measurement, which is the diode
forward voltage. Because the temperature coefficient of the
diode is known but the actual forward voltage can have a wide
tolerance, it is not possible to program the high and low limit
registers with predetermined values.
Instead, it is necessary to calibrate the temperature measure-
ment, calculate the TEMP1 readings at the high and low limit
temperatures, and then program those values into the limit
registers, as follows:
1.
Calculate
LSB per degree
=
2.1 mV/(
V
REF
/4096).
2.
Save the calibration reading
D
CAL
at calibration temperature
T
CAL
.
3.
Subtract
T
CAL
from limit temperatures
T
HIGH
and
T
LOW
to get
the difference in degrees between the limit temperatures
and the calibration temperature.
4.
Multiply this value by
LSB per degree
to get the value in
LSBs.
5.
Add these values to the digital value at the calibration
temperature to get the digital high and low limit values.
Example:
The internal 2.5 V reference is used.
1.
T
HIGH
= +65°C and
T
LOW
=
10°C.
2.
LSB per degree
=
2.1 × 10
3
/(2.5/4096) =
3.44.
3.
D
CAL
= 983 decimal at 25°C.
4.
D
HIGH
= (65
25) ×
3.44 + 983 = 845.
5.
D
LOW
= (
10
25) ×
3.44 + 983 = 1103.
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AD7877ACPZ-REEL 功能描述:IC ADC 12BIT TOUCHSCREEN 32LFCSP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 觸摸屏控制器 系列:- 標(biāo)準(zhǔn)包裝:96 系列:- 類型:- 觸摸面板接口:- 輸入數(shù)/鍵:- 分辨率（位）:- 評(píng)估套件:* 數(shù)據(jù)接口:- 數(shù)據(jù)速率/采樣率 (SPS，BPS):- 電壓基準(zhǔn):- 電源電壓:- 電流 - 電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:帶卷 (TR)
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