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| 型号： | MCP3901A0T-E/SS |
| 厂商： | Microchip Technology |
| 文件页数： | 3/30页 |
| 文件大小： | 0K |
| 描述： | IC ENERGY METER AFE 2CH 20-SSOP |
| 标准包装： | 1,600 |
| 位数： | 24 |
| 通道数： | 2 |
| 电压 - 电源，模拟： | 4.5 V ~ 5.5 V |
| 电压 - 电源，数字： | 2.7 V ~ 5.5 V |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 20-SSOP |
| 包装： | 带卷 (TR) |
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PCA2002
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 8 — 25 November 2011
11 of 30
NXP Semiconductors
PCA2002
32 kHz watch circuit with programmable output period and pulse width
8.9 Frequency tuning at assembled watch
Figure 7 shows the test set-up for frequency tuning the assembled watch.
8.10 Measurement of the oscillator frequency and the inhibition time
The output of the two measuring states can either be monitored directly at pin RESET or
as a modulation of the supply current (a modulating resistor of 30 k
is connected
between VDD and VSS when the signal at pin RESET is at HIGH-level).
The supply voltage modulation must be followed as shown in Figure 4 in order to
guarantee the correct start-up of the circuit during production and testing.
Measuring states:
State 1; quartz crystal oscillator frequency divided by 1024; state 1 starts with a pulse
to VP and ends with a second pulse to VP
State 2; inhibition time has a value of n 0.122 ms. A signal with the periodicity of
31.25 ms + n
0.122 ms appears at pin RESET and as current modulation at pin V
DD
Fig 7.
Frequency tuning the assembled watch
mgw568
FREQUENCY
COUNTER
PROGRAMMABLE
DC POWER SUPPLY
PC INTERFACE
PC
M
motor
32 kHz
PCA200x
battery
Fig 8.
Output waveform at pin RESET for instruction state 2
mgw355
VDD
VSS
31.25 ms
+ inhibition time
VO(dif)
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相关代理商/技术参数 |
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| MCP3901A0T-I/ML | 功能描述:模数转换器 - ADC Dual CH Energy Meter Front End,SPI IF 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 |
| MCP3901A0T-I/SS | 功能描述:模数转换器 - ADC Dual CH Energy Meter Front End,SPI IF 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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| MCP3901A1-I/SS | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Two Channel Analog Front End |
| MCP3901A1T-I/ML | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Two Channel Analog Front End |
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