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參數(shù)資料
| 型號(hào)： | 71M6521FE-IM/F |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類(lèi)： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, QCC68 |
| 封裝： | LEAD FREE, LQFN-68 |
| 文件頁(yè)數(shù)： | 42/103頁(yè) |
| 文件大?。?/td> | 1691K |
| 代理商： | 71M6521FE-IM/F |
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71M6521DE/71M6521FE
Energy Meter IC
DATA SHEET
OCTOBER 2010
v1.1
2005-2010 Teridian Semiconductor Corporation
Page: 43 of 103
A Maxim Integrated Products Brand
19-5370; 10/10
LCD interface memory is powered by the non-volatile supply. The bits of the LCD memory are preserved in
LCD and SLEEP modes, even if their pin is not configured as SEG. In this case, they can be useful as general-
purpose nonvolatile storage.
Battery Monitor
The battery voltage is measured by the ADC during alternative MUX frames if the BME (Battery Measure Enable) bit is set.
While BME is set, an on-chip 45k
load resistor is applied to the battery and a scaled fraction of the battery voltage is applied
to the ADC input. After each alternative MUX frame, the result of the ADC conversion is available at CE DRAM address 0x07.
BME is ignored and assumed zero when system power is not available. See the Battery Monitor section of the Electrical
Specification section for details regarding the ADC LSB size and the conversion accuracy.
EEPROM Interface
The 71M6521DE/FE provides hardware support for either type of EEPROM interface, a two-pin interface and a three-pin
interface. The interfaces use the EECTRL and EEDATA registers for communication.
Two-Pin EEPROM Interface
The dedicated 2-pin serial interface communicates with external EEPROM devices. The interface is multiplexed onto pins
DIO4 (SCK) and DIO5 (SDA) controlled by the DIO_EEX bit I/O RAM (see I/O RAM Table). The MPU communicates with the
interface through two SFR registers: EEDATA and EECTRL. If the MPU wishes to write a byte of data to EEPROM, it places the
data in EEDATA and then writes the ‘Transmit’ command (CMD = 0011) to EECTRL. This initiates the transmit operation. The
transmit operation is finished when the BUSY bit falls. Interrupt INT5 is also asserted when BUSY falls. The MPU can then
check the RX_ACK bit to see if the EEPROM acknowledged the transmission.
A byte is read by writing the ‘Receive’ command (CMD = 0001) to EECTRL and waiting for the BUSY bit to fall. Upon comple-
tion, the received data is in EEDATA. The serial transmit and receive clock is 78kHz during each transmission, and the clock is
held in a high state until the next transmission. The bits in EECTRL are shown in Table 57.
The EEPROM interface can also be operated by controlling the DIO4 and DIO5 pins directly (“bit-banging”). However, con-
trolling DIO4 and DIO5 directly is discouraged, because it may tie up the MPU to the point where it may become too
busy to process interrupts.
Status
Bit
Name
Read/
Write
Reset
State
Polarity
Description
7
ERROR
R
0
Positive
1 when an illegal command is received.
6
BUSY
R
0
Positive
1 when serial data bus is busy.
5
RX_ACK
R
1
Negative
0 indicates that the EEPROM sent an ACK bit.
4
TX_ACK
R
1
Negative
0 indicates when an ACK bit has been sent to the EEPROM
3-0
CMD[3:0
]
W
0
Positive,
see CMD
Table
CMD
Operation
0000
No-op. Applying the no-op command will stop the I
2C clock
(SCK, DIO4). Failure to issue the no-op command will keep
the SCK signal toggling.
0001
Receive a byte from EEPROM and send ACK.
0011
Transmit a byte to EEPROM.
0101
Issue a ‘STOP’ sequence.
0110
Receive the last byte from EEPROM, do not send ACK.
1001
Issue a ‘START’ sequence.
Others
No Operation, set the ERROR bit.
Table 57: EECTRL Status Bits
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| 71M6521FE-IGT/F | SPECIALTY ANALOG CIRCUIT, QFP64 |
| 71M6531D-IMR/F | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC68 |
| 71M6532D-IGTR/F | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQFP100 |
| 71M6532F-IGT/F | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQFP100 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 71M6521FE-IMR | 制造商:Maxim Integrated Products 功能描述:Metering Systems on a Chip - SoC Residential Energy Meter IC |
| 71M6521FE-IMR/F | 功能描述:計(jì)量片上系統(tǒng) - SoC Residential Energy Meter IC RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 處理器系列:71M6511 類(lèi)型:Metering SoC 最大時(shí)鐘頻率:70 Hz 程序存儲(chǔ)器大小:64 KB 數(shù)據(jù) RAM 大小:7 KB 接口類(lèi)型:UART 可編程輸入/輸出端數(shù)量:12 片上 ADC: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-64 封裝:Reel |
| 71M6521-TGP1-68M | 制造商:Maxim Integrated Products 功能描述:Programmer Accessories Gang Programmer Base w/6521 Socket Brd |
| 71M6523-DB | 功能描述:開(kāi)發(fā)板和工具包 - 8051 71M6521D Demo Brd RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評(píng)估:C8051F960, Si7005 核心: 接口類(lèi)型:USB 工作電源電壓: |
| 71M6523-IM | 功能描述:計(jì)量片上系統(tǒng) - SoC Residential Energy Meter IC RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 處理器系列:71M6511 類(lèi)型:Metering SoC 最大時(shí)鐘頻率:70 Hz 程序存儲(chǔ)器大小:64 KB 數(shù)據(jù) RAM 大小:7 KB 接口類(lèi)型:UART 可編程輸入/輸出端數(shù)量:12 片上 ADC: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-64 封裝:Reel |
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