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| 型号： | EVAL-ADE5169EBZ-2 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 128/156页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD5169 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电度表/功率表 |
| 嵌入式： | 是 |
| 已用 IC / 零件： | ADE5169 |
| 主要属性： | 用于汇编语言和 C 代码的 IAR 工具 |
| 次要属性： | 隔离和非隔离输出选项 |
| 已供物品： | 板，软件 |
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ADE5166/ADE5169/ADE5566/ADE5569
RTC CRYSTAL COMPENSATION
The RTC provides registers to compensate for the tolerance of
the crystal frequency and its variation over temperature. Up to
±248 ppm frequency error can be calibrated out by the RTC
Data Sheet
faster than in the normal mode, resulting in timekeeping registers
that represent seconds/125, minutes/125, and hours/125, instead
of seconds, minutes, and hours. Therefore, this mode should be
used for calibration only.
circuitry. The compensation is fully digital and implemented
by adding or subtracting pulses from the crystal clock signal.
Table 138. RTC Calibration Options
Calibration
f RTCCAL
The resolution of the RTC nominal compensation SFR
(RTCCOMP, Address 0xF6) is ±2 ppm/LSB, or 0.17 sec/day/LSB.
The RTC compensation circuitry adds the RTC temperature com-
pensation SFR (TEMPCAL, Address 0xF7) and the RTCCOMP
SFR to determine how much compensation is required. The sum
Option
Normal Mode 0
Normal Mode 1
Calibration Mode 0
Calibration Mode 1
FSEL Bits
00
01
10
11
Window (sec)
30.5
30.5
0.244
0.244
(Hz)
1
512
500
16,000
RTCCOMP =
× (second/day Error )
of these two registers is limited to ±248 ppm, or 42.85 sec/day.
RTC Calibration
The nominal crystal frequency can be calibrated by adjusting
the RTCCOMP SFR so that the clock going into the RTC is
precisely 32.768 kHz at 25°C.
Calibration Flow
An RTC calibration pulse output is on up to four pins configured
by the four LSBs in the RTC calibration configuration register
(RTC_CAL, Address 0x0F). Enable the RTC output by setting
the CAL_EN bit (RTC_CAL[6]).
The RTC calibration is accurate to within ±2 ppm over a 30.5 sec
window in all operational modes: PSM0, PSM1, and PSM2. Two
output frequencies are offered for the normal RTC mode: 1 Hz
with the FSEL bits = 00 and 512 Hz with the FSEL bits = 01
(RTC_CAL[5:4]).
A shorter window of 0.244 sec is offered for fast calibration during
PSM0 or PSM1 mode. Two output frequencies are offered for this
RTC calibration output mode: 500 Hz with the FSEL bits = 10 and
When no RTC compensation is applied, with RTCCOMP and
TEMPCAL equal to zero, the nominal compensation required
to account for the error in the external crystal can be deter-
mined. In this case, it is not necessary to wait for an entire
calibration window to determine the error in the pulse output.
Calculating the error in frequency between two consecutive
pulses on the RTC calibration pin is sufficient.
The value to write to the RTCCOMP SFR is calculated from the
% error or seconds per day error on the frequency output. Each
bit of the RTCCOMP SFR represents 2 ppm of correction, where
1 sec/day error is equal to 11.57 ppm.
RTCCOMP = 5000 × (% Error )
1
2 × 11 . 57
During calibration, user software writes the current time to the
RTC. Refer to the Access to Internal RTC Registers section for
more information on how to read and write to the RTC time-
keeping registers.
16 kHz with the FSEL bits = 11 (RTC_CAL[5:4]). Note that for
the 0.244 sec calibration window, the RTC is clocked 125 times
Rev. D | Page 128 of 156
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相关代理商/技术参数 |
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|---|---|
| EVAL-ADE5169F62EBZ | 制造商:Analog Devices 功能描述:EVALUATION BOARD FOR ADE5169 - Boxed Product (Development Kits) 制造商:Rochester Electronics LLC 功能描述: |
| EVAL-ADE5569F62EBZ | 制造商:AD 制造商全称:Analog Devices 功能描述:Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver |
| EVAL-ADE7169EBZ-2 | 功能描述:BOARD EVALUATION FOR ADE7169F16 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:PCI Express® (PCIe) 主要目的:接口，收发器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要属性:- 次要属性:- 已供物品:板 |
| EVAL-ADE7169F16EB | 制造商:AD 制造商全称:Analog Devices 功能描述:Single-Phase Energy Measurement IC with 8052 MCU, RTC and LCD driver |
| EVAL-ADE7169F16EBZ | 制造商:Analog Devices 功能描述:Evaluation Board For ADE7169 制造商:Analog Devices 功能描述:EVAL BD FOR ADE7169 - Bulk |
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