CY8CMBR2016-24LQXI Cypress Semiconductor, CY8CMBR2016-24LQXI Datasheet - Page 11

• Manufacturer Part Number: CY8CMBR2016-24LQXI
• Description: Touch Screen Converters & Controllers
• Manufacturer: Cypress Semiconductor
• Type: Capacitive Touch Controllersr

Specifications of CY8CMBR2016-24LQXI

• Rohs: yes
• Input Type: 16 Key
• Supply Voltage: 1.71 V to 5.5 V
• Supply Current: 3.3 mA
• Operating Temperature: - 40 C to + 85 C
• Package / Case: QFN-48
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Factory Pack Quantity: 490
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 1.71 V

Output Select
■
■
Scan Rate
■
■
■
Sensitivity
■
■
■
■
Document Number: 001-67921 Rev. *C
One among the three output interfaces defined earlier in the
section can be selected by the hardware configuration on the
OUT_SEL pin. Refer
configuration details.
Only one of the three output interfaces can be used at a given
time.
This defines the rate at which the device scans all the buttons
and then sleeps, in the Low Power Sleep mode. For more
details about Low Power Sleep mode, refer to
Consumption and Device Operating Modes on page
The device scan rate is defined by the hardware configuration
on the SCAN pin. Refer
details.
Device power consumption is dependent on Scan Rate. For a
higher scan rate, the power consumption is less, and vice
versa. Refer to the
for power calculations.
Sensitivity is defined as the minimum change in capacitance
which can be detected as a finger touch.
Use higher sensitivity setting when the overlay thickness is
higher, or the button diameter is small.
Use a lower sensitivity setting when power consumption needs
to be low.
Possible sensitivity settings are “High”, “Medium”, and “Low”.
CY8CMBR2016 Design
Table 18
Table 18
Button
Output
in
Figure 9. System Diagnostics of Disabled Button - Scenario 1
Appendix on page 26
in
Appendix on page 26
Guide, section 5
Figure 8. Button Auto Reset
Auto Reset period
15.
for pin
Power
for
■
System Diagnostics
A built-in power on self test (POST) mechanism detects the
following at power on reset (POR), which can be useful in
production testing. Any failure is reported on the OUT_6 and
OUT_7 pins, as detailed below.
Button Shorted to Ground
If a button is disabled/found shorted to Ground (as shown in
Figure
and the same is sent out serially through the OUT_6 pin,
synchronised with a 2 kHz clock on OUT_7 pin.
If no clock is sensed on OUT_7 till 300 ms after power-on, then
all the buttons have passed the System Diagnostics. If a clock is
sensed, then starting from the first falling edge of the clock, each
button takes up one clock slot. A high output on OUT_6 during a
falling edge on OUT_7 indicates a failure of the button in that
clock slot.
The clock output stops after indicating the last failed button. For
instance, if Button 1, 3 and 5 are disabled, then the System
Diagnostics data is transmitted as shown in
is marked by a HIGH on OUT_6 in the 0.5 ms to 1 ms slot. CS3
failure is marked by a HIGH on OUT_6 in the 1.5 ms to 2 ms slot.
CS5 failure is marked by a HIGH on OUT_6 in the 2.5 ms to 3
ms slot. After indicating the failure of CS5, clock output is
ceased.
As an example,
when CS1, CS3 and CS15 fail the POST.
Sensitivity can be controlled by the hardware configuration on
the SENSITIVITY pin. For details, refer to
on page
Button is touched for more
than the Auto Reset period
11), then the corresponding bit in the button mask is set,
after Auto Reset period
Output is not driven
26.
Figure 10
shows the System Diagnostics output
CY8CMBR2016
Table 18
Figure
Page 11 of 28
9. CS1 failure
in
Appendix