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参数资料
| 型号： | TC3401VQR |
| 元件分类： | ADC |
| 英文描述： | 2-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16 |
| 封装： | QSOP-16 |
| 文件页数： | 2/16页 |
| 文件大小： | 458K |
| 代理商： | TC3401VQR |
TC3401
DS21410B-page 10
2002 Microchip Technology Inc.
3.3
VDD Monitor
The TC3401 RESET output is in high impedance
provided the voltage at VTH is greater than the internal
voltage reference. This reference is approximately the
same value as the voltage appearing at REFOUT.When
VTH is less than the internal reference, RESET is pulled
low. When VTH rises above the internal reference
voltage again, RESET is held low for the reset active
time-out period, t9, before being released. The RESET
output is ensured to be valid for VDD = 1.3V to 5.5V.
When used to generate a Power-on or Brown-out
Reset, an external resistor network is required to divide
the appropriate VDD threshold down to 1.23V at the
VTH input, (See the Typical Application circuit). For
example, to generate a POR for a VDD at 3V -10%, the
values of R1 and R2 should be 137k
and 115k
respectively.
Since RESET is an open drain, it can be wired-OR’ed
with another open drain or external switch if desired.
3.4
Power Fail Detector
The Power Fail detector is a comparator in which the
inverting input is connected to the internal voltage
reference. The non-inverting input is the PFI pin of the
TC3401 and the PFO pin is the active low, open drain
output. This comparator is suitable as an early warning
fail or low battery indicator. In a typical application,
where a voltage regulator is being used to supply
power to a system, the Power Fail comparator would
monitor the input voltage to the regulator while the VDD
monitor would measure the output voltage of the
regulator. Both PFO and RESET would drive interrupt
pins of a microcontroller.
ThePower Fail detector may beusedas a Wake-upor
Watchdog Timer. The Typical Application circuit shows
an RC network on PFI with the capacitor tied to a
tristated
C I/O pin. If R4 is 1 M and C2 is 10F, the
time constant is roughly ten seconds. The
C resets
the RC network by driving the I/O tied to PFI low and
then tristating it. The RC network will ramp to 1.23V in
roughly 9 seconds, assuming a VBATT of 3.0V. With
PFO tied to a
C input or interrupt, the C will see a low
to high transition on PFO when the voltage on PFI
exceeds 1.23V. The PFO output is specified to be valid
for VDD =1.3 to 5.5V.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC3401VQRTR | 功能描述:模数转换器 - ADC 16-Bit Sigma-Delta 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 |
| TC3402 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:+1.8 Low Power, Quad Input, 16-Bit Sigma-Delta A/D Converter |
| TC3402VPE | 功能描述:模数转换器 - ADC 16-Bit Sigma-Delta 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 |
| TC3402VQR | 功能描述:模数转换器 - ADC 16-Bit Sigma-Delta 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 |
| TC3402VQRTR | 功能描述:模数转换器 - ADC 16-Bit Sigma-Delta 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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