em3027 EM Microelectronic, em3027 Datasheet - Page 22
em3027
Manufacturer Part Number
em3027
Description
Real-time Clock With I2c Or Spi Interface, Crystal Temperature Compensation, Battery Switchover And Trickle Charger
Manufacturer
EM Microelectronic
Datasheet
1.EM3027.pdf
(27 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
em3027IDS
Manufacturer:
EM
Quantity:
20 000
Part Number:
em3027IDSSO8B+
Manufacturer:
EMMICRO
Quantity:
20 000
Verified by design. Not tested in production
Notes:
Calculation of external-pull up
All of the following conditions have to be met:
Copyright © 2008, EM Microelectronic-Marin SA
07/08 – rev B
1) Falling time on SDA driven by EM3027 can be shorter than 20 + 0.1* C
2) There are parasitic diodes between SCL, SDA pads and
3) Device does not internally provide a hold time of 300ns as required by I2C standard.
- Rise time is equal to 0.847* R
- Maximum sink current driven by SDA pad in output mode => R
PU
* C
B
=> Rpu < t
.
Figure 8 : Timing - I2C
R max
/(0.847* C
Vcc
power supply.
B
PU
22
).
<
Vcc
/ I
B
SINK min
as required by I2C standard.
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