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| 型号： | 71M6531D-IMR/F |
| 厂商： | Maxim Integrated |
| 文件页数： | 36/121页 |
| 文件大小： | 0K |
| 描述： | IC ENERGY METER 128KB 68-QFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | * |
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Data Sheet 71M6531D/F-71M6532D/F
FDS 6531/6532 005
1.5
1.5.1
On-Chip Resources
Oscillator
The oscillator of the 71M6531D/F and 71M6532D/F drives a standard 32.768 kHz watch crystal. These
crystals are accurate and do not require a high-current oscillator circuit. The oscillator of the 71M6531D/F
and 71M6532D/F has been designed specifically to handle these crystals and is compatible with their
high impedance and limited power handling capability.
Oscillator calibration can improve the accuracy of both the RTC and metering. Refer to Section 1.5.3 Re-
The oscillator is powered directly and only from VBAT, which therefore must be connected to a DC voltage
source. The oscillator requires approximately 100 nA, which is negligible compared to the internal leakage
of a battery.
The oscillator may appear to work when VBAT is not connected, but this mode of operation is not
recommended.
If VBAT is connected to a drained battery or disconnected, a battery test that sets BME may drain
VBAT’s supply and cause the oscillator to stop. A stopped oscillator may force the device to reset.
Therefore, an unexpected reset during a battery test should be interpreted as a battery failure.
1.5.2
Internal Clocks
Timing for the device is derived from the 32.768 kHz crystal oscillator output. On-chip timing functions
include:
?
?
?
?
?
The MPU clock (CKMPU)
The emulator clock (2 x CKMPU)
The clock for the CE (CKCE)
The clock driving the delta-sigma ADC along with the FIR (CKADC, CKFIR)
A real time clock (RTC).
The two general-purpose counter/timers contained in the MPU are controlled by CKMPU (see Section
1.4.7 Timers and Counters ). Table 37 provides a summary of the available clock functions.
Table 37: Clock System Summary
÷ 2 / [1,0]
÷ 3 / [0,1]
÷ 4 / [0,0]
Clock
Derived
From
MCK Divider / [ M40MHZ, M26MHZ ]
**
Brownout
Mode
CKPLL
MCK
Crystal
CKPLL
78.6432 MHz
39.3216 MHz
78.6432
MHz
26.2144
MHz
78.6432
MHz
19.6608
MHz
off
112 kHz
MHz
MHz
CKCE
MCK
4.9152
?
9.8304
?
6.5536MHz
4.9152 MHz
off
9.8304 MHz
6.5536 MHz
4.9152 MHz
CKADC / CKFIR
CKMPU maximum
MCK
MCK
4.9152 MHz
***
6.5536 MHz
***
4.9152 MHz
***
28 kHz
28 kHz
Default state at power-up
The maximum CKMPU frequency. CKMPU can be reduced from this rate using MPU_DIV[2:0].
CKCE = 9.8304 MHz when CE10MHZ is set, 4.9152 MHz otherwise.
CK32 MCK 32.768 kHz 32.768 kHz 32.768 kHz
**
***
?
The master clock, MCK, is generated by an on-chip PLL that multiplies the oscillator output frequency
(CK32) by 2400 to provide approximately 80 MHz (78.6432 MHz). A divider controlled by the I/O RAM
bits M40MHZ and M26MHZ permits scaling of MCK by ?, ? and ?. All other clocks are derived from this
scaled MCK output (making them multiples of 32768 Hz), and the clock skew is matched so that the rising
edges of CKADC, CKCE, CK32 and CKMPU are aligned.
36
Rev 2
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相关代理商/技术参数 |
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|---|---|
| 71M6531F | 制造商:TERIDIAN 制造商全称:TERIDIAN 功能描述:Energy Meter IC |
| 71M6531F-DB | 功能描述:开发板和工具包 - 8051 71M6531F Demo Brd RoHS:否 制造商:Silicon Labs 产品:Development Kits 工具用于评估:C8051F960, Si7005 核心: 接口类型:USB 工作电源电压: |
| 71M6531F-IM/F | 功能描述:计量片上系统 - SoC Residential Energy Meter IC RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 处理器系列:71M6511 类型:Metering SoC 最大时钟频率:70 Hz 程序存储器大小:64 KB 数据 RAM 大小:7 KB 接口类型:UART 可编程输入/输出端数量:12 片上 ADC: 安装风格:SMD/SMT 封装 / 箱体:LQFP-64 封装:Reel |
| 71M6531F-IM/F3 | 功能描述:计量片上系统 - SoC RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 处理器系列:71M6511 类型:Metering SoC 最大时钟频率:70 Hz 程序存储器大小:64 KB 数据 RAM 大小:7 KB 接口类型:UART 可编程输入/输出端数量:12 片上 ADC: 安装风格:SMD/SMT 封装 / 箱体:LQFP-64 封装:Reel |
| 71M6531F-IM/F4 | 功能描述:计量片上系统 - SoC RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 处理器系列:71M6511 类型:Metering SoC 最大时钟频率:70 Hz 程序存储器大小:64 KB 数据 RAM 大小:7 KB 接口类型:UART 可编程输入/输出端数量:12 片上 ADC: 安装风格:SMD/SMT 封装 / 箱体:LQFP-64 封装:Reel |
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