CY8CMBR2044_12 Datasheet, PDF (21/29 Pages) Cypress Semiconductor – Four Button CapSense® Controller

CY8CMBR2044
AC Electrical Specifications
AC Chip-Level Specifications
The following table lists guaranteed maximum and minimum specifications for the entire voltage and temperature ranges.
Parameter
SR_{POWER_UP}
T_XRST
T_XRST2
Description
Power supply slew rate
External reset pulse width at power up
External reset pulse width after
power-up
AC General Purpose I/O Specifications
Min Max Unit
Notes
–
250 V/ms V_DD slew rate during power up
1
–
ms After supply voltage is valid
10
–
µs Applies after part has booted
Parameter
TRise1
TRise2
TRise3
TRise2
TRise4
TFall2
Description
Rise time on GPO0 and GPO1,
Cload = 50 pF
Rise time on GPO2 and GPO3,
Cload = 50 pF
Rise time on GPO0 and GPO1,
Cload = 50 pF
Rise time on GPO2 and GPO3,
Cload = 50 pF
Fall time, Cload=50 pF all GPO outputs
Fall time, Cload=50 pF all GPO outputs
CapSense Specifications
Min Typ
15
–
10
–
15
–
10
–
10
–
10
–
Max
80
50
80
80
50
70
Unit
Notes
ns V_DD = 3.0 to 3.6 V, 10% – 90%
ns V_DD = 3.0 to 3.6 V, 10% – 90%
ns V_DD = 1.71 to 3.0V, 10% – 90%
ns V_DD = 1.71 to 3.0 V, 10% – 90%
ns V_DD = 3.0 to 3.6 V, 90% – 10%
ns V_DD = 1.71 to 3.0 V, 90% – 10%
Parameter
C_P
Description
Parasitic capacitance
C_F
C_PIN
C_MOD
Rs
Finger capacitance
Capacitive load on pins as input
External modulator capacitor
Series resistor between pin and the
sensor
Min Typ
Max
Unit
Notes
5.0
– (C_P+C_F)<40 pF C_P is the total capacitance seen
by the pin when no finger is
present. C_P is sum of C_BUTTON,
C_TRACE, and Capacitance of
the vias and C_PIN
0.25 – (C_P+C_F)<40 pF C_F is the capacitance added by
the finger touch
0.5 1.7
7
pF
2 2.2
2.4
nF Mandatory for CapSense to
work
– 560
616
 Reduces the RF noise
Document Number: 001-57451 Rev. *E
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