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| 型号： | SH1475IMLTRT |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PQCC36 |
| 封装： | 6 X 6 MM, 0.50 MM PITCH, ROHS COMPLIANT, PLASTIC, MLPQ-36 |
| 文件页数： | 6/11页 |
| 文件大小： | 143K |
| 代理商： | SH1475IMLTRT |
SH1475
CAPACITIVE SIGNAL CONDITIONING CIRCUIT
Copyright 1999-2005 Semtech Corporation
SH1475 data sheet v1.08 (2005-04-21)
www.semtech.com
4
The SH1475 interfaces with a PCB-based capacitive sensor with six separate sensor plates and one common
sensing line. Each separate sensor plate and the common sensing line are coupled via a capacitor. The customer
may choose to use individual capacitors (designated C10 through C15 on the application circuit), or the coupling
capacitors could be built-into the PCB, by providing a common sense plate under the sensor plates.
The shape of the sensing area could be readily modified to accommodate the design requirements of the customer,
and may include (but not limited to) the linear, rectangular, circular, spiral, smooth wave or zigzag. The sensing area
may also be applied over a 3-dimentional object, such as a semi-sphere.
Typically, all the sensor electrodes are isolated from the outside of the customer’s device by a layer of galvanically
isolating non-conductive dielectric (plastic). It could be a sheet of Mylar with adhesive backing, or the galvanic
barrier could be built-into the customer’s device enclosure.
The apparent capacitance of the sensor plate to ground increases when a finger approaches a sensor plate. The
capacitance increase is directly proportional to the overlap area between the tip of the finger and the sensor plate,
and it is inversely proportional to the distance between the finger and the sensor plate. By looking at change of
capacitance on all six electrodes, it is possible to extrapolate the actual position of the finger with high accuracy and
resolution.
The SH1475 measures the changes of capacitance for each of the sensor plates, one by one. Each sensor plate is
repeatedly charged, and the charge is transferred to one of two sampling capacitors, the so-called positive and
negative sample capacitors. The sampling algorithm is arranged in such a way that the resulting voltage on the
series-connected sampling capacitors is proportional to the change of capacitance for the sensor plate, while any
noise coupled from the outside is greatly reduced.
The actual capacitance-change signal is quite small, typically under 1 mV Full Scale. The signal conditioning circuit
balances and amplifies the incoming signals for digitizing by the built-in A/D converter.
The SH1475 does one measurement for each of the six sensor plates to get the capacitance changes. The SH1475
derives the touch/proximity and position information from these six measurements.
SELF-POWER MANAGEMENT
The SH1475 implements a comprehensive power algorithm called Self-Power Management to maximize power
savings. The SH1475 works in two modes: active and standby. When the SH1475 is in standby mode, it transitions
to active state and samples the capacitive sensor and switches every 150 ms; if no touch is detected, it returns to
standby state immediately. When the SH1475 detects a touch on the capacitive sensor, or a press on any of the
switches, it stays in active mode and reduces the sampling period to 15 ms. Once both the touch sensor and the
switches are released, the SH1475 goes back to standby mode. The transition between active mode and standby
mode is automatic.
Active
Wake up to sample
No touch detected
Standby
Touch
detected
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| SH150C-1.5-250 | 功能描述:INDUCTOR 250UH 1.50A 150KHZ CLP RoHS:是 类别:电感器，线圈，扼流圈 >> 固定式 系列:SH150 标准包装:500 系列:1331 电感:1.2µH 电流:247mA 电流 - 饱和:247mA 电流 - 温升:- 类型:铁芯体 容差:±10% 屏蔽:屏蔽 DC 电阻(DCR):最大 730 毫欧 Q因子@频率:40 @ 7.9MHz 频率 - 自谐振:130MHz 材料 - 芯体:铁 封装/外壳:0.312" L x 0.115" W x 0.135" H（7.94mm x 2.92mm x 3.43mm） 安装类型:表面贴装 包装:带卷 (TR) 工作温度:-55°C ~ 105°C 频率 - 测试:7.9MHz |
| SH150C-1.81-168 | 功能描述:INDUCTOR 168UH 1.81A 150KHZ CLP RoHS:是 类别:电感器，线圈，扼流圈 >> 固定式 系列:SH150 标准包装:500 系列:1331 电感:1.2µH 电流:247mA 电流 - 饱和:247mA 电流 - 温升:- 类型:铁芯体 容差:±10% 屏蔽:屏蔽 DC 电阻(DCR):最大 730 毫欧 Q因子@频率:40 @ 7.9MHz 频率 - 自谐振:130MHz 材料 - 芯体:铁 封装/外壳:0.312" L x 0.115" W x 0.135" H（7.94mm x 2.92mm x 3.43mm） 安装类型:表面贴装 包装:带卷 (TR) 工作温度:-55°C ~ 105°C 频率 - 测试:7.9MHz |
| SH150C-2.22-114 | 功能描述:INDUCTOR 114UH 2.22A 150KHZ CLP RoHS:是 类别:电感器，线圈，扼流圈 >> 固定式 系列:SH150 标准包装:500 系列:1331 电感:1.2µH 电流:247mA 电流 - 饱和:247mA 电流 - 温升:- 类型:铁芯体 容差:±10% 屏蔽:屏蔽 DC 电阻(DCR):最大 730 毫欧 Q因子@频率:40 @ 7.9MHz 频率 - 自谐振:130MHz 材料 - 芯体:铁 封装/外壳:0.312" L x 0.115" W x 0.135" H（7.94mm x 2.92mm x 3.43mm） 安装类型:表面贴装 包装:带卷 (TR) 工作温度:-55°C ~ 105°C 频率 - 测试:7.9MHz |
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