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| 型号： | MAX1234EVC16 |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 32/44页 |
| 文件大小： | 0K |
| 描述： | EV SYSTEM/EV KIT MAX1233/MAX1234 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1,000 |
| 系列： | * |
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±15kV ESD-Protected Touch-Screen
Controllers Include DAC and Keypad Controller
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
HOST WRITES
ADC
CONTROL REGISTER
START CLOCK
SET BUSY
LOW
AUXILIARY INPUT 1 OR
AUXILIARY INPUT 2
level. The forward diode voltage (V BE ) vs. temperature is
a well-defined characteristic. The ambient temperature
can be predicted in applications by knowing the value
of the V BE voltage at a fixed temperature and then moni-
toring 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
NO
IS ADC
REFERENCE IN
AUTO POWER-DOWN
MODE?
YES
POWER UP REFERENCE
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.
POWER UP
ADC
CONVERT
AUXILIARY INPUT 1 OR 2
POWER DOWN
ADC
POWER DOWN REFERENCE
SET BUSY HIGH
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
NO
IS DATA
AVERAGING DONE?
TURN OFF CLOCK
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:
Δ V BE = (kT/q) ? ln(N)
where:
YES
STORE AUXILIARY INPUT 1 OR 2 IN
AUX1 OR AUX2 REGISTER
Figure 16. Auxiliary Input Flowchart
DONE
Δ 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:
MUX
A/D
CONVERTER
T(°K) = q x Δ V / (k × ln(N))
TEMP1
TEMP2
Figure 17. Internal Block Diagram of Temperature Sensor
32
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PDF描述 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1234EVKIT | 制造商:Maxim Integrated Products 功能描述:+15KV ESD-PROTECTED TOUCH-SCREEN CO - Rail/Tube |
| MAX1236EUA | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX1236EUA+ | 功能描述:模数转换器 - ADC 12-Bit 4Ch 94.4ksps 5.5V Precision ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX1236EUA+T | 功能描述:模数转换器 - ADC 12-Bit 4Ch 94.4ksps 5.5V Precision ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX1236EUA-T | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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