SDA
SCL
t
HD,DAT
t
SU,DAT
t
HD,STA
t
HIGH
t
LOW
t
BUF
t
HD,STA
t
SU,STA
t
SP
t
SU,STO
MSP430G2955
MSP430G2855
MSP430G2755
SLAS800 – MARCH 2013
www.ti.com
USCI (I2C Mode)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) (see
Figure 26
)
PARAMETER
TEST CONDITIONS
V
CC
MIN
TYP
MAX
UNIT
f
USCI
USCI input clock frequency
SMCLK, duty cycle = 50% ± 10%
f
SYSTEM
MHz
f
SCL
SCL clock frequency
3 V
0
400
kHz
f
SCL
≤
100 kHz
4.0
t
HD,STA
Hold time (repeated) START
3 V
µs
f
SCL
> 100 kHz
0.6
f
SCL
≤
100 kHz
4.7
t
SU,STA
Setup time for a repeated START
3 V
µs
f
SCL
> 100 kHz
0.6
t
HD,DAT
Data hold time
3 V
0
ns
t
SU,DAT
Data setup time
3 V
250
ns
t
SU,STO
Setup time for STOP
3 V
4.0
µs
Pulse duration of spikes suppressed
t
SP
3 V
50
100
600
ns
by input filter
Figure 26. I2C Mode Timing
Compa
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
V
CC
MIN
TYP
MAX
UNIT
I
(DD)
See
(1)
CAON = 1, CARSEL = 0, CAREF = 0
3 V
45
µA
CAON = 1, CARSEL = 0,
I
(Refladder/
CAREF = 1, 2, or 3,
3 V
45
µA
RefDiode)
No load at CA0 and CA1
V
(IC)
Common-mode input voltage
CAON = 1
3 V
0
V
CC
-1
V
PCA0 = 1, CARSEL = 1, CAREF = 1,
V
(Ref025)
(Voltage at 0.25 V
CC
node) / V
CC
3 V
0.24
No load at CA0 and CA1
PCA0 = 1, CARSEL = 1, CAREF = 2,
V
(Ref050)
(Voltage at 0.5 V
CC
node) / V
CC
3 V
0.48
No load at CA0 and CA1
PCA0 = 1, CARSEL = 1, CAREF = 3,
V
(RefVT)
See
Figure 27
and
Figure 28
3 V
490
mV
No load at CA0 and CA1, T
A
= 85°C
V
(offset)
Offset voltage
(2)
3 V
±10
mV
V
hys
Input hysteresis
CAON = 1
3 V
0.7
mV
T
A
= 25°C, Overdrive 10 mV,
120
ns
Without filter: CAF = 0
Response time
t
(response)
3 V
(low-to-high and high-to-low)
T
A
= 25°C, Overdrive 10 mV,
1.5
µs
With filter: CAF = 1
(1)
The leakage current for the Compa terminals is identical to I
lkg(Px.y)
specification.
(2)
The input offset voltage can be cancelled by using the CAEX bit to invert the Compa inputs on successive measurements. The
two successive measurements are then summed together.
36
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