Datasheet

LTC2942-1
4
29421f
Timing Diagram
t
SU, DAT
t
SU, STO
t
SU, STA
t
BUF
t
HD, STA
t
HD, DATO,
t
HD, DATI
t
HD, STA
START
CONDITION
STOP
CONDITION
REPEATED START
CONDITION
START
CONDITION
SDA
SCL
29421 F01
t
of
Figure 1. Definition of Timing on I
2
C Bus
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t
HD,DATI(MIN)
Minimum Data Hold Time Input
l
0 µs
t
HD,DATO
Data Hold Time Output
l
0.3 0.9 µs
t
of
Data Output Fall Time (Notes 7, 8)
l
20 + 0.1 • C
B
300 ns
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All currents into pins are positive, all voltages are referenced to
GND unless otherwise specified
Note 3: I
SUPPLY
= I
SENSE
+
+ I
SENSE
–
Note 4: The equivalent charge of an LSB in the accumulated charge
register depends on the setting of the internal prescaling factor M:
q
LSB
= 0.085mAh•
M
128
See Choosing Coulomb Counter Prescaler M section for more information.
1mAh = 3.6C (Coulombs).
Note 5: Deviation of q
LSB
from its nominal value. Data is for a new device
and does not include long-term sense resistor aging. See the Internal
Sense Resistor section for more information.
Note 6: The quantization step of the 14-bit ADC in voltage mode and
10-bit ADC in temperature mode is not to be mistaken with the LSB of the
combined 16-bit voltage registers (I, J) and 16-bit temperature registers
(M, N).
Note 7: C
B
= Capacitance of one bus line in pF (10pF ≤ C
B
≤ 400pF). See
Voltage and Temperature Registers section for more information.
Note 8: Guaranteed by design, not subject to test.
Note 9: Value decreases if exposed pad is soldered to large copper area.
See Power Dissipation section for more information.
Note 10: Use for scaling of temperature reading only. Do not use part
outside operating temperature range.