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參數(shù)資料
| 型號： | MAX1441GUP/V+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 40/41頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC PROXMITY SENSOR 2CH 20-TSSOP |
| 其它有關(guān)文件： | Automotive Product Guide |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 74 |
| 類型： | 觸控式傳感器 |
| 輸入類型： | 數(shù)字 |
| 輸出類型： | 數(shù)字 |
| 接口： | JTAG，串行 |
| 電流 - 電源： | 100µA |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-TSSOP |
| 包裝： | 管件 |
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MAX1441
Automotive, Two-Channel Proximity and
Touch Sensor
8
Detailed Description
The MAX1441 is a 2-channel proximity and touch sensor
that contains all the functions necessary to implement
a proximity/touch detection system for vehicle PRKE
systems and other applications. There are four principal
architectural components to the device: the capacitive
sensing analog front-end (AFE), a programmable CPU
system, vehicle power, and I/O interface. Figure 1 shows
the JTAG timing diagram.
The AFE uses a 2-channel C2D converter to measure the
capacitance present between sensor inputs SINPUT1
and SINPUT2 and the ambient ground (Figure 2). The
AFE-sensing architecture converts approaching hand
motion to 12-bit digital words that are operated by
an algorithm in the CPU to ensure detection of posi-
tive events and minimizing false detections. The C2D
converters can measure the input capacitance in three
different ranges: 20pF, 10pF, and 5pF. Additionally, the
C2Ds compensate up to 63pF of parasitic capacitance
programmable in 1pF steps.
In addition to capacitive proximity and touch detection,
the AFE contains POR and a watchdog timer for monitor-
ing CPU operations. The CPU runs the input capacitive
data through an algorithm to ensure detection of positive
events and minimizing false detections. The CPU system
includes Flash-based program memory, SRAM, clocks,
and communications. The power input and signal out-
puts provide a complete interface to the vehicle power
system and a robust communication signal to remote
electronic control modules (ECUs).
Technical Function
Each C2D converter produces an AC excitation voltage
at inputs SINPUT1 and SINPUT2. The excitation voltage
forces current through the capacitance connected to the
sensor input. The current amplitude is proportional to the
measured capacitance. The circuit measures the input
capacitance by measuring the current flowing through
the sensor inputs. This excitation signal is a sine wave
with a frequency programmable from 100kHz to 500kHz
in 10kHz steps. The sinusoidal excitation allows for much
lower EMI emissions compared to architectures that uti-
lize simple square-wave excitation.
The device drives the guard outputs AGUD1 and AGUD2
with the same signal from the sinusoidal excitation and
shields the sense electrodes without adding parasitic
capacitance. The converter measures the amplitude of
the current and converts it to 12-bit digital data by a
12-bit C2D. The maximum conversion rate in each of the
sensor channels is 1.66kHz.
The microcontroller reads the input capacitance values
and uses a user-supplied custom algorithm to detect
the object proximity. Once the proximity is detected,
Figure 1. JTAG Timing Diagram
TCK
t1
t2
t3
t4
t5
t6
t7
TDI, TMS
TDO
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| MAX1441IUP+ | 功能描述:電容觸摸傳感器 RoHS:否 制造商:Microchip Technology 電源電壓: 通道數(shù)量: 封裝 / 箱體: 尺寸: 溫度范圍: |
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| MAX1444EHJ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1444EHJ/V+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC ANALOG TO DIGITAL CONVERTER RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1444EHJ/V+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 40Msps 3.0V Low-Power ADC with Internal Reference RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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