em3027 EM Microelectronic, em3027 Datasheet - Page 11

• Manufacturer Part Number: em3027
• Description: Real-time Clock With I2c Or Spi Interface, Crystal Temperature Compensation, Battery Switchover And Trickle Charger
• Manufacturer: EM Microelectronic

Timer Page - Registers TimLow, TimHigh
Temperature Page - Register Temp
EEPROM Data Page - Register EEData
EEPROM Control Page - Register EECtrl
EEPROM Control Page - Register XtalOffset
EEPROM Control Page - Register Qcoef
EEPROM Control Page - Register TurnOver
RAM Page - Register RAMdata
Copyright © 2008, EM Microelectronic-Marin SA
07/08 – rev B
Where XtalOffset
Note: Coefficient 1.05 (exactly 1.048576) is the result of the internally used frequency compensated method.
TimLow
TimHigh
Temp
EEData
R80k, R20k,
R5k, R1.5k
FD0, FD1
ThEn
ThPer
XtalOffset
Qcoef
TurnOver
Where T
RAMdata
Where Qcoef
R
0_real
is real value of Turn over temperature of the used crystal in °C.
real
is real value of thermal quadratic coefficient of the used crystal in ppm/°C².
real
Timer value (Low byte)
Timer value (High byte)
Temperature (range from -60° C to 190°C with 0°C corresponding to a content of 60d)
EEPROM data used for user general purpose
Selects Trickle resistors between V
Selects clocks frequency at IRQ/CLKOUT pin.
Thermometer Enable
Selects the thermometer scan period, voltage detector scan period (‘0’ – 1 second; ‘1’ – 16
seconds)
Crystal frequency deviation at Turn over temperature T
to 60 ppm.
XtalOffset=1.05*XtalOffset
Thermal quadratic coefficient of the crystal. Example: value 151d is related to 0.035 ppm/°C²;
Qcoef = 4096 x 1.05 x QCoef
Turn over temperature of the crystal (values 0 to 63d are related to temperature 4 to 67 °C).
Example: value 21d is related to 25°C.
T
RAM data used for application general purposes
0
is real value of crystal frequency deviation at Turn over temperature of the used crystal in ppm.
= T
0_real
– 4,
real
real
High
11
and V
Back
O
in ppm. Example: value 63d is related
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EM3027