- 您现在的位置：买卖IC网 > PDF目录20637 > MCP3905A-I/SS (Microchip Technology)IC POWER METERING-1 PHASE 24SSOP PDF资料下载
参数资料
| 型号： | MCP3905A-I/SS |
| 厂商： | Microchip Technology |
| 文件页数： | 17/32页 |
| 文件大小： | 0K |
| 描述： | IC POWER METERING-1 PHASE 24SSOP |
| 产品培训模块： | MCP3901 Analog Front End |
| 标准包装： | 59 |
| 输入阻抗： | 390 千欧 |
| 测量误差： | 0.1% |
| 电压 - 高输入/输出： | 2.4V |
| 电压 - 低输入/输出： | 0.85V |
| 电流 - 电源： | 2.7mA |
| 电源电压： | 4.5 V ~ 5.5 V |
| 测量仪表类型： | 单相 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 管件 |
| 产品目录页面： | 677 (CN2011-ZH PDF) |
| 配用： | MCP3905RD-PM1-ND - REFERENCE DESIGN FOR MCP3905 MCP3905EV-ND - BOARD DEMO FOR MCP3905 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页当前第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页
MCP3905A/05L/06A
4.3 Ultra-Low Drift V REF
The MCP3905A/05L/06A devices contain an internal
voltage reference source specially designed to mini-
mize drift over temperature. This internal V REF supplies
reference voltage to both current and voltage channel
ADCs. The typical value of this voltage reference is
2.4V ±100 mV. The internal reference has a very low
typical temperature coefficient of ±15 ppm/°C, allowing
the output frequencies to have minimal variation with
respect to temperature since they are proportional to
(1/V REF )2.
The output pin for the voltage reference is REFIN/OUT.
Appropriate bypass capacitors must be connected to
the REFIN/OUT pin for proper operation (see
Figure 4-3 illustrates the different conditions for a
power-up and a power-down event in the typical
conditions.
AV DD
5V
4.2V
4V
1s
Section 5.0 “Applications Information” ). The
voltage reference source impedance is typically 4 k Ω,
which enables this voltage reference to be overdriven
0V
DEVICE
MODE
RESET
NO
PULSE
OUT
PROPER
OPERATION
RESET
Time
by an external voltage reference source.
If an external voltage reference source is connected to
FIGURE 4-3:
Power-on Reset Operation.
the REFIN/OUT pin, the external voltage will be used
as the reference for both current and voltage channel
4.5
High-Pass Filters and Multiplier
ADCs. The voltage across the source resistor will then
be the difference between the internal and external
voltage. The allowed input range for the external
voltage source goes from 2.2V to 2.6V for accurate
measurement error. A V REF value outside of this range
will cause additional heating and power consumption
due to the source resistor, which might affect measure-
ment error.
The active real-power value is extracted from the DC
instantaneous power. Therefore, any DC offset
component present on Channel 0 and Channel 1
affects the DC component of the instantaneous power
and will cause the real-power calculation to be
erroneous. In order to remove DC offset components
from the instantaneous power signal, a high-pass filter
has been introduced on each channel. Since the high-
pass filtering introduces phase delay, identical high-
4.4
Power-On Reset (POR)
pass filters are implemented on both channels. The
The MCP3905A/05L/06A devices contain an internal
POR circuit that monitors analog supply voltage AV DD
during operation. This circuit ensures correct device
startup at system power-up and system power-down
events. The POR circuit has built-in hysteresis and a
timer to give a high degree of immunity to potential
ripple and noise on the power supplies, allowing proper
settling of the power supply during power-up. A 0.1 μF
decoupling capacitor should be mounted as close as
possible to the AV DD pin, providing additional transient
filters are clocked by the same digital signal, ensuring
a phase difference between the two channels of less
than one MCLK period. Under typical conditions
(MCLK = 3.58 MHz), this phase difference is less than
0.005°, with a line frequency of 50 Hz. The cut-off
frequency of the filter (4.45 Hz) has been chosen to
induce minimal gain error at typical line frequencies,
allowing sufficient settling time for the desired
applications. The two high-pass filters can be disabled
by applying logic ‘ 0 ’ to the HPF pin.
immunity (see
Information” ).
Section 5.0 “Applications
0
The threshold voltage is typically set at 4V, with a
tolerance of about ±5%. If the supply voltage falls below
this threshold, the MCP3905A/05L/06A devices will be
held in a Reset condition (equivalent to applying logic
‘ 0 ’ on the MCLR pin). The typical hysteresis value is
approximately 200 mV in order to prevent glitches on
the power supply.
Once a power-up event has occurred, an internal timer
-5
-10
-15
-20
-25
-30
-35
-40
prevents the part from outputting any pulse for
0.1
1
10
100
1000
approximately 1s (with MCLK = 3.58 MHz), thereby
Frequency (Hz)
preventing potential metastability due to intermittent
resets caused by an unsettled regulated power supply.
FIGURE 4-4:
HPF Magnitude Response
(MCLK = 3.58 MHz).
? 2006-2011 Microchip Technology Inc.
DS22011B-page 17
相关PDF资料 |
PDF描述 |
|---|---|
| MAX16810ATU+T | IC LED DRVR WT/RGB BCKLT 38-TQFN |
| RSO-4815SZ/H2 | CONV DC/DC 1W 18-72VIN 15VOUT |
| HIP6601BCBZ-T | IC DRVR MOSFET SYNC BUCK 8-SOIC |
| VI-2N1-CX | CONVERTER MOD DC/DC 12V 75W |
| ECJ12DSCH | CONN EDGECARD 24POS .150 SQ WW |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP3905AT-E/SS | 功能描述:模数转换器 - ADC Energy Meter IC Gain 116 5001 Dynamic E 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 |
| MCP3905AT-I/SS | 功能描述:模数转换器 - ADC Dynamic Range Energy Meter IC 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 |
| MCP3905EV | 功能描述:电源管理IC开发工具 MCP3905 Energy Mtr IC Eval Brd RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MCP3905-I/SS | 功能描述:IC ENERGY METER 24-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 能量测量 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:* |
| MCP3905L | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Energy-Metering ICs with Active (Real) Power Pulse Output |
发布紧急采购，3分钟左右您将得到回复。