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| 型号： | 71M6543GH-IGTR/F |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQFP100 |
| 封装： | LEAD FREE, LQFP-100 |
| 文件页数： | 106/157页 |
| 文件大小： | 2178K |
| 代理商： | 71M6543GH-IGTR/F |
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71M6543F/H and 71M6543G/GH Data Sheet
52
2008–2011 Teridian Semiconductor Corporation
v1.2
Table 43: RTC Control Registers
Name
Location
Rst
Wk
Dir
Description
RTCA_ADJ[6:0]
2504[6:0]
40
--
R/W
Register for analog RTC frequency adjustment.
RTC_P[16:14]
RTC_P[13:6]
RTC_P[5:0]
289B[2:0]
289C[7:0]
289D[7:2]
4
0
4
0
R/W
Registers for digital RTC adjustment.
0x0FFBF
≤ RTC_P ≤ 0x10040
RTC_Q[1:0]
289D[1:0]
0
R/W
Register for digital RTC adjustment.
RTC_RD
2890[6]
0
R/W
Freezes the RTC shadow register so it is suitable for
MPU reads. When RTC_RD is read, it returns the
status of the shadow register: 0 = up to date, 1 =
frozen.
Writing 0 to RTC_RD bit to enable shadow register
update, and writing 1 to RTC_RD to disable update
RTC_WR
2890[7]
0
R/W
Freezes the RTC shadow register so it is suitable for
MPU write operations. When RTC_WR is cleared, the
contents of the shadow register are written to the RTC
counter on the next RTC clock (~1 kHz). When
RTC_WR is read, it returns 1 as long as RTC_WR is
set, and continues to return one until the RTC counter
is updated.
Writing 0 to RTC_WR bit to enable copying the shadow
register contents to RTC counter, and writing 1 to
RTC_WR to disable copying
RTC_FAIL
2890[4]
0
R/W
Indicates that a count error has occurred in the RTC
and that the time is not trustworthy. This bit can be
cleared by writing a 0.
RTC_SBSC[7:0]
2892[7:0]
R
Time remaining since the last 1 second boundary.
LSB = 1/128 second.
2.5.4.3 RTC Rate Control
The 71M6543 has two rate adjustment mechanisms:
The first rate adjustment mechanism is an analog rate adjustment, using the I/O RAM register
RTCA_ADJ[6:0], that trims the crystal load capacitance.
The second rate adjustment mechanism is a digital rate adjust that affects the way the clock frequency
is processed in the RTC.
Setting RTCA_ADJ[6:0] to 00 minimizes the load capacitance, maximizing the oscillator frequency. Setting
RTCA_ADJ[6:0] to 0x7F maximizes the load capacitance, minimizing the oscillator frequency. The adjustable
capacitance is approximately:
pF
ADJ
RTCA
C
ADJ
5
.
16
128
_
=
The precise amount of adjustment depends on the crystal properties, the PCB layout and the value of the
external crystal capacitors (see CXS and CXS in Table 89). The adjustment may occur at any time, and the
resulting clock frequency should be measured over a one-second interval.
The second rate adjustment is digital, and can be used to adjust the clock rate up to
±988ppm, with a
resolution of 3.8 ppm. The rate adjustment is implemented starting at the next second-boundary
following the adjustment. Since the LSB (define first) results in an adjustment every four seconds, the
frequency should be measured over an interval that is a multiple of four seconds.
The clock rate is adjusted by writing the appropriate values to RTC_P[16:0] (I/O RAM 0x289B[2:0], 0x289C,
0x289D[7:2]) and RTC_Q[1:0] (I/O RAM 0x289D[1:0]). Updates to RTC rate adjust registers, RTC_P and
RTC_Q, are done through the shadow register described above. The new values are loaded into the
counters when RTC_WR (I/O RAM 0x2890[7]) is lowered.
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相关代理商/技术参数 |
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|---|---|
| 71M6543GHT-IGT/F | 制造商:Maxim Integrated Products 功能描述:3-PHASE, 128KB, PRES TEMP SENSOR, HI PREC - Bulk |
| 71M6543GHT-IGTR/F | 制造商:Maxim Integrated Products 功能描述:3-PHASE, 128KB, PRES TEMP SENSOR, HI PREC - Tape and Reel |
| 71M6543G-IGT/F | 功能描述:计量片上系统 - SoC Precision 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 |
| 71M6543G-IGTR/F | 功能描述:计量片上系统 - SoC Precision 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 |
| 71M6543GT-IGT/F | 制造商:Maxim Integrated Products 功能描述:3-PHASE, 128KK, PRES TEMP SENSOR - Bulk |
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