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EM3027IDSWS8 bảng dữ liệu(PDF) 23 Page - EM Microelectronic - MARIN SA

tên linh kiện EM3027IDSWS8
Giải thích chi tiết về linh kiện  Real Time Clock with I2C or SPI, Crystal Temperature Compensation, Battery Switchover and Trickle Charger
PDF  28 Pages
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nhà sản xuất  EMMICRO [EM Microelectronic - MARIN SA]
Trang chủ  http://www.emmicroelectronic.com
Logo EMMICRO - EM Microelectronic - MARIN SA

EM3027IDSWS8 bảng dữ liệu(HTML) 23 Page - EM Microelectronic - MARIN SA

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EM3027
Copyright
 2013, EM Microelectronic-Marin SA
3027-DS.doc, Version 8.0, 25-Jan-13
23
www.emmicroelectronic.com
The following conditions have to be met:
Rise time is equal to 0.847 RPU (CB + N * CI/O)  RPU < tR max / (0.847 (CB + N CI/O)), where N is total number of
I/O pins connected to the corresponding bus line.
(tR in ns, C in pF, R in kΩ)
The minimum value of the pullup resistor value can be calculated with the IOL value of the SDA output:
RPU = (Vcc – VOL) / IOL
( IOL: see Table 7, page 5, Output Parameters; e.g. 5mA at VCC = 5.0V, with VOL = 0.8V )
SCL
Start
SDA
tBUF
tHD:STA
tLOW
tR
tHD:DAT
tHIGH
tF
tSU:DAT
tSU:STA
tSU:STO
Stop
Figure 8: I2C Timing
10.2
I2C Specification compliance
EM3027 device with I2C serial interface was designed
in compliance with Philips Semiconductors I
2C-bus
specification UM10204 (Rev. 03
– 19 June 2007), Fast-
mode class (up to 400kbit/s). Device address consists
of 7 bits. Clock stretching is not supported.
Brief manual to I2C interface read and write
transmissions is to be found in §7.1.
There are, however, the following discrepancies between
I2C specification and EM3027 interface:
1)
Falling time on SDA driven by EM3027 can be
shorter than 20 + 0.1* CB ns. (CB is total capacitive
load for SDA bus line in pF) In other words, slope
control of falling edges on SDA is missing.
2)
Some timing parameters differ from the original I2C
specification
– refer to Table 13.



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