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參數資料
| 型號： | MAX1233-MAX1234 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 【15kV ESD-Protected Touch-Screen Controllers Include DAC and Keypad Controller |
| 中文描述： | 【15kV ESD保護觸摸屏控制器包括DAC和鍵盤控制器 |
| 文件頁數： | 32/44頁 |
| 文件大?。?/td> | 706K |
| 代理商： | MAX1233-MAX1234 |
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M
±15kV ESD-Protected Touch-Screen
Controllers Include DAC and Keypad Controller
32
______________________________________________________________________________________
Auxiliary Analog Inputs
Two auxiliary analog inputs (AUX1 and AUX2) allow the
MAX1233/MAX1234 to monitor analog input voltages
from zero to V
REF
.
Figure
16 illustrates the process of
auxiliary input reading.
Temperature Measurements
The MAX1233/MAX1234 provide two temperature mea-
surement options: a single-ended conversion method
and a differential conversion method. Both temperature
measurement techniques rely on the semiconductor
junction
’
s operational characteristics at a fixed current
level. The forward diode voltage (V
BE
) vs. temperature
is a well-defined characteristic. The ambient tempera-
ture can be predicted in applications by knowing the
value of the V
BE
voltage at a fixed temperature and then
monitoring the delta of that voltage as the temperature
changes.
Figure
17 illustrates the functional block of the
internal temperature sensor.
The single conversion method requires calibration at a
known temperature, but only requires a single reading
to predict the ambient temperature. First, the internal
diode forward bias voltage is measured by the ADC at a
known temperature. Subsequent diode measurements
provide an estimate of the ambient temperature through
extrapolation. This assumes a temperature coefficient of
-2.1mV/
°
C. The single conversion method results in a
resolution of 0.29
°
C/LSB (2.5V reference) and
0.12
°
C/LSB (1.0V reference) with a typical accuracy of
±2
°
C.
Figure
18 shows the flowchart for the single tem-
perature measurement.
The differential conversion method uses two measure-
ment points. The first measurement is performed with a
fixed bias current into the internal diode. The second
measurement is performed with a fixed multiple of the
original bias current. The voltage difference between the
first and second conversion is proportional to the
absolute temperature and is expressed by the following
formula:
V
BE
= (kT/q)
ln(N)
where:
V
BE
= difference in diode voltage
N = current ratio of the second measurement to the first
measurement
k = Boltzmann
’
s constant (1.38
×
10
-23
eV/
°
Kelvin)
q = electron charge (1.60
×
10
-19
C)
T = temperature in
°
Kelvin
The resultant equation solving for
°
K is:
T(
°
K) = q x
V / (k
×
ln(N))
AUXILIARY INPUT 1 OR
AUXILIARY INPUT 2
DONE
NO
IS DATA
AVERAGING DONE
STORE AUXILIARY INPUT 1 OR 2 IN
AUX1 OR AUX2 REGISTER
POWER DOWN
ADC
POWER UP
ADC
POWER UP REFERENCE
CONVERT
AUXILIARY INPUT 1 OR 2
POWER DOWN REFERENCE
TURN OFF CLOCK
HOST WRITES
ADC
CONTROL REGISTER
START CLOCK
IS ADC
REFERENCE IN
AUTO POWER-DOWN
MODE
NO
YES
SET BUSY
LOW
YES
SET BUSY HIGH
Figure 16. Auxiliary Input Flowchart
TEMP1
TEMP2
A/D
CONVERTER
MUX
Figure 17. Internal Block Diagram of Temperature Sensor
相關PDF資料 |
PDF描述 |
|---|---|
| MAX1233 | 【15kV ESD-Protected Touch-Screen Controllers Include DAC and Keypad Controller |
| MAX1233EGI | 【15kV ESD-Protected Touch-Screen Controllers Include DAC and Keypad Controller |
| MAX1234EGI | 【15kV ESD-Protected Touch-Screen Controllers Include DAC and Keypad Controller |
| MAX1239 | 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs |
| MAX1239LEEE | 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX1234EGI | 功能描述:觸摸屏轉換器和控制器 RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數據速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| MAX1234EGI+ | 制造商:Maxim Integrated Products 功能描述:TOUCH SCREEN CONTROLLER 28-PIN QFN EP - Rail/Tube |
| MAX1234EGI-T | 功能描述:觸摸屏轉換器和控制器 RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數據速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| MAX1234ETI+ | 功能描述:觸摸屏轉換器和控制器 4Ch uWire QSPI/SPI Touch Interface RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數據速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| MAX1234ETI+T | 功能描述:觸摸屏轉換器和控制器 4Ch uWire QSPI/SPI Touch Interface RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數據速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
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