AK4161 Datasheet, PDF (8/12 Pages) Asahi Kasei Microsystems – 6-channel Capacitive Touch Sensor IC

[AK4161]
SWITCHING CHARACTERISTICS
(Ta = -40C ~ 85C, VDD = 1.6V ~ 3.6V; unless otherwise specified)
Parameter
Symbol min
typ max Unit
Internal Oscillator
Fast Oscillator Period
Slow Oscillator Period
FPRD
75
125 175 ns
SPRD
21
32
43 us
Reset Timing
Reset Pulse Width (Note 15)
Reset Pin Pulse Width of Spike Noise
Suppressed by Input Filter (Note 16)
tRW
10
-
tRS
0.5
-
-
us
-
us
I2C
SCL clock frequency
Bus Free Time Between Transmissions
f_SCL
-
tBUF
1.3
-
400 kHz
-
-
us
Start Condition Hold Time (prior to first Clock pulse)
tHD:STA 0.6
-
-
us
Clock Low Time
tLOW
1.3
-
-
us
Clock High Time
tHIGH
0.6
-
-
us
Setup Time for Repeated Start Condition
tSU:STA 0.6
-
-
us
SDA Hold Time from SCL Falling (Note 17)
tHD:DAT
0
-
-
us
SDA Setup Time from SCL Rising
tSU:DAT 0.1
-
-
us
Rise Time of Both SDA and SCL Lines
tR
-
-
0.3 us
Fall Time of Both SDA and SCL Lines
tF
-
-
0.3 us
Setup Time for Stop Condition
tSU:STO 0.6
-
-
us
Pulse Width of Spike Noise Suppressed By Input Filter
tSP
50
-
-
ns
Capacitive load on bus
Cb
-
-
400 pF
Note 15. The AK4161 can be reset by the RSTN pin = “L”. Keep “L” period for 10us or more for a certain reset.
Note 16. Pulse width of spike noise suppressed by input filter of the RSTN pin.
Note 17. Data must be held for sufficient time to bridge the 300ns transition time of SCL.
RSTN
tRW
Figure 2. Reset Timing Diagram
tRS
50%VDD
SDA
SCL
tBUF
tLOW tR
tHIGH tF
tHD:STA
Stop Start
tHD:DAT tSU:DAT tSU:STA
Start
Figure 3. I²C Interface Timing Diagram
VIH
VIL
tSP
VIH
VIL
tSU:STO
Stop
MS1450-E-02-PB
-8-
2014/05