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| 型號： | 71M6513-IGTR/F |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQFP100 |
| 封裝： | LEAD FREE, LQFP-100 |
| 文件頁數(shù)： | 42/104頁 |
| 文件大?。?/td> | 1390K |
| 代理商： | 71M6513-IGTR/F |
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71M6513/71M6513H
3-Phase Energy Meter IC
DATA SHEET
AUGUST 2011
Page: 42 of 104
2005-2011 Teridian Semiconductor Corporation
A Maxim Integrated Products Brand
Oscillator
The oscillator drives a standard 32.768kHz watch crystal (see Figure 9). Crystals of this type are accurate and do not require a
high current oscillator circuit. The oscillator in the 71M6513 Power Meter IC has been designed specifically to handle watch
crystals and is compatible with their high impedance and limited power handling capability. The oscillator power dissipation is
very low to maximize the lifetime of any battery backup device attached to the VBAT pin.
Figure 9: Oscillator Circuit
The oscillator should be placed as close as possible to the IC, and vias should be avoided.
An external resistor across the crystal must not be added.
Real-Time Clock (RTC)
The RTC is driven directly by the crystal oscillator. In the absence of the 3.3V supply, the RTC is powered by the external
battery (VBAT pin). The RTC consists of a counter chain and output registers. The counter chain consists of seconds, minutes,
hours, day of week, day of month, month, and year. The RTC is capable of processing leap years. Each counter has its own
output register. Whenever the MPU reads the seconds register, all other output registers are automatically updated. Since the
RTC clock is not coherent to the MPU clock, the MPU must read the seconds register until two consecutive reads are the
same (requires either 2 or 3 reads). At this point, all RTC output registers will have the correct time. Regardless of the MPU
clock speed, RTC reads require one wait state.
The RTC interrupt must be enabled using the I/O RAM register EX_RTC (address 0x2002[1]). RTC time is set by writing to the
I/O RAM registers RTC_SEC, RTC_MIN, through RTC_YR. Each byte written to RTC must be delayed at least 3 CK32 cycles
from any previous byte written to RTC.
Two time correction bits, the I/O RAM registers RTC_DEC_SEC (0x201C[1]) and RTC_INC_SEC (0x201C[0]) are provided to
adjust the RTC time. A pulse on one of these bits causes the time to be decremented or incremented by an additional second
at the next update of the RTC_SEC register. Thus, if the crystal temperature coefficient is known, the MPU firmware can
integrate temperature and correct the RTC time as necessary as discussed in temperature compensation.
Comparators (V2, V3)
The 71M6513/6513H includes two programmable comparators that are connected to the V2 and V3 pins. The I/O RAM
register COMP_INT (0x2003[4:3]) allows the user to determine if comparators 2 and 3 will trigger an interrupt to the MPU. The
output of each comparator is available in the COMPSTAT register. VBIAS is used as the threshold, and built-in hysteresis
prevents each comparator from repeatedly responding to low-amplitude noise.
Comparators 2 and 3 can be used for early warning of power faults, or for monitoring of battery or other DC voltages. If they
are both selected to interrupt the MPU, their outputs will be XORed together. The voltage at V3 is also available to the ADC in
the AFE, but the comparator should not be used when V3 is used for analog measurements.
Comparator 1 is part of the power fault circuitry (see section V1 Pin) and cannot be programmed.
crystal
XOUT
XIN
71M651X
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 71M6515H | 制造商:TERIDIAN 制造商全稱:TERIDIAN 功能描述:Energy Meter IC |
| 71M6515H_11 | 制造商:TERIDIAN 制造商全稱:TERIDIAN 功能描述:Up to 10ppmC precision ultra-stable voltage reference Digital temperature compensation |
| 71M6515H-DB | 功能描述:開發(fā)板和工具包 - 8051 71M6515H Demo Brd RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評估:C8051F960, Si7005 核心: 接口類型:USB 工作電源電壓: |
| 71M6515H-IGT | 制造商:Maxim Integrated Products 功能描述:METERING FRONT END - Rail/Tube |
| 71M6515H-IGT/F | 功能描述:計量片上系統(tǒng) - SoC Energy Meter IC RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 處理器系列:71M6511 類型:Metering SoC 最大時鐘頻率:70 Hz 程序存儲器大小:64 KB 數(shù)據(jù) RAM 大小:7 KB 接口類型:UART 可編程輸入/輸出端數(shù)量:12 片上 ADC: 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-64 封裝:Reel |
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