Rainbow Electronics MAXQ2010 - Manual (Page 10)

MAXQ2010
16-Bit Mixed-Signal Microcontroller with LCD
10 ______________________________________________________________________________________
I 2 C ELECTRICAL CHARACTERISTICS
(V DVDD = V AVDD = 2.7V to 3.6V, T A = -40°C to +85°C.)
Note 19: Devices that use nonstandard supply voltages that do not conform to the intended I 2 C bus system levels must relate their
input levels to the voltage to which the pullup resistors R P are connected. See Figure 3.
Note 20: C B —Capacitance of one bus line in pF.
Note 21: The maximum fall time of 300ns for the SDA and SCL bus lines shown in the I 2 C Bus Controller Timing table is longer than
the specified maximum t OF_I2C of 250ns for the output stages. This allows series protection resistors (R S ) to be connected
between the SDA/SCL pins and the SDA/SCL bus lines as shown in the I 2 C Bus Controller Timing (Acting as I 2 C Slave)
table without exceeding the maximum specified fall time. See Figure 3.
SDA
P6.7
SCL
P6.6
R S R S
I 2 C
DEVICE
R S R S
I 2 C
DEVICE
R P R P
V DVDD
MAXQ2010
Figure 3. Series Resistors (R S ) for Protecting Against High-Voltage Spikes
STANDARD MODE FAST MODE
PARAMETER SYMBOL TEST CONDITIONS
MIN MAX MIN MAX
UNITS
Input Low Voltage (Note 19) V IL_I2C -0.5 0.3 x V DVDD -0.5 0.3 x V DVDD V
Input High Voltage (Note 19) V IH_I2C 0.7 x V DVDD 0.7 x V DVDD V DVDD + 0.5V V
Input Hysteresis (Schmitt) V IHYS_I2C V DVDD > 2V 0.05 x V DVDD V
Output Logic-Low (Open
Drain or Open Collector)
V OL_I2C
V DVDD > 2V, 3mA sink
current
0 0.4 0 0.4 V
Output Fall Time from
V
IH_MIN to V IL_MAX with Bus
Capacitance from 10pF to
400pF (Notes 20, 21)
t OF_I2C 250 20 + 0.1C B 250 ns
Pulse Width of Spike
Filtering That Must Be
Suppressed by Input Filter
t SP_I2C 0 50 ns
Input Current on I/O I IN_I2C
Input voltage from 0.1 x
V
DVDD to 0.9 x V DVDD
-10 +10 -10 +10 μA
I/O Capacitance C IO_I2C 10 10 pF