参数资料
| 型号： | ADE7116ASTZF8 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 125/152页 |
| 文件大小： | 0K |
| 描述： | IC ENERGY METER 64-LQFP |
| 产品变化通告： | Product Discontinuance 27/Oct/2011 |
| 标准包装： | 160 |
| 输入阻抗： | 770 千欧 |
| 测量误差： | 0.1% |
| 电压 - 高输入/输出： | 2V |
| 电压 - 低输入/输出： | 0.8V |
| 电流 - 电源： | 4mA |
| 电源电压： | 2.4 V ~ 3.7 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： | 64-LQFP |
| 供应商设备封装： | 64-LQFP（10x10） |
| 包装： | 托盘 |
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ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/ADE7569
Take care when changing the interval timer time base. The
recommended procedure is as follows:
A shorter window of 0.244 sec is offered for fast calibration
during PSM0 or PSM1 mode. Two output frequencies are
1.
2.
If the alarm interval SFR (INTVAL, Address 0xA6) is going
to be modified, write to this register first. Then, wait for
one 128 Hz clock cycle to synchronize with the RTC,
64,000 cycles at a 4.096 MHz instruction cycle clock.
Disable the interval timer by clearing the ITEN bit in the
RTC configuration SFR (TIMECON, Address 0xA1).
Then, wait for one 128 Hz clock cycle to synchronize with
offered for this RTC calibration output mode: 500 Hz with
FSEL = 10 and 16 kHz with FSEL = 11 in the INTPR SFR.
Note that for the 0.244 second calibration window, the RTC is
clocked 125 times faster than in 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.
3.
the RTC, 64,000 cycles at a 4.096 MHz instruction cycle
clock.
Read the TIMECON SFR to ensure that the ITEN bit is
Table 138. RTC Calibration Options
Calibration
Option FSEL Window (sec)
f RTCCAL
(Hz)
4.
clear. If it is not, wait for another 128 Hz clock cycle.
Set the time-base bits (ITS) in the TIMECON SFR to
configure the interval. Wait for a 128 Hz clock cycle for this
change to take effect.
Normal Mode 0
Normal Mode 1
Calibration Mode 0
Calibration Mode 1
00
01
10
11
30.5
30.5
0.244
0.244
1
512
500
16,000
The RTC alarm event wakes the 8052 MCU core if the MCU is
in PSM2 mode when the alarm event occurs.
RTC CALIBRATION
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 with the RTC
circuitry. The compensation is fully digital and implemented by
adding or subtracting pulses from the crystal clock signal.
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
compensation SFR (TEMPCAL, Address 0xF7) and the RTC
When no RTC compensation is applied, RTCCOMP and
TEMPCAL are equal to zero, the nominal compensation
required to account for the error in the external crystal can be
determined. In this case, it is not necessary to wait for an entire
calibration window to determine the error in the pulse output.
Calculating at the error in frequency between two consecutive
pulses on the P0.2/CF1/RTCCAL 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
LSB of the RTCCOMP SFR represents 2 ppm of correction
where 1 sec/day error is equal to 11.57 ppm.
RTCCOMP = 5000 × (% Error )
nominal compensation SFR (RTCCOMP, Address 0xF6) to
determine how much compensation is required. The sum of
RTCCOMP =
1
2 × 11 . 57
× ( sec/day Error )
these two registers is limited to ±248 ppm or 42.85 sec/day.
Calibrating the RTC
The nominal crystal frequency can be calibrated by adjusting
During calibration, user software writes the current time. Refer
to the Read and Write Operations section for more information
on how to read and write to the RTC timekeeping registers.
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 provided on the P0.2/CF1/
RTCCAL pin. Enable the RTC output by setting the RTCCAL
bit in the interrupt pins configuration SFR (INTPR,
Address 0xFF).
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 FSEL = 00 and 512 Hz with FSEL = 01 in the interrupt pins
configuration SFR (INTPR, Address 0xFF).
Rev. B | Page 125 of 1 5 2
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