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PDF CY8CMBR2016 Data sheet ( Hoja de datos )
| Número de pieza | CY8CMBR2016 | |
| Descripción | 16 Button Matrix Controller | |
| Fabricantes | Cypress Semiconductor | |
| Logotipo |  |
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CY8CMBR2016
CapSense® Express™ 16 Button Matrix
Controller
FeaturesCapacitive Button Controllers
■ Hardware Configurable Matrix CapSense® Controller
❐ Does not require software tools or programming
❐ 16 buttons can be configured individually or as a matrix
❐ Supports 3x4 and 4x4 matrix configurations
■ Matrix Host Interface Communication
❐ Industry standard host interface protocols reuse existing host
processor firmware
• Key Scan Interface
• Truth Table Interface
❐ Encoded GPO Interface - minimizes number of pins required
■ SmartSense™ Auto-Tuning
❐ Maintains optimal button performance even in noisy
environments
❐ CapSense parameters dynamically set in runtime
❐ Wide parasitic capacitance (CP) range (5–40 pF)
❐ Saves time and effort in device tuning
■ Noise Immunity
❐ High sensitivity, low noise capacitive sensing algorithm
❐ Strong immunity to RF and AC noise
❐ Low radiated noise emission
■ System Diagnostics of CapSense Buttons
❐ Reports any faults at device power up
❐ Button shorts
❐ Improper value of modulating capacitor (CMOD)
❐ Parasitic capacitance (CP) out of range
■ Advanced Features
❐ Flanking Sensor Suppression (FSS) provides robust sensing
even with closely spaced buttons
❐ Buzzer Signal Output
❐ Configurable sensitivity for all buttons
❐ Interrupt line to host to indicate any CapSense button status
change
❐ Serial Debug Data out
• Simplifies production line testing and system debug
■ Wide operating range
❐ 1.71–5.5 V
❐ Ideal for both regulated and unregulated battery
applications [1]
■ Low power consumption
❐ Supply current in run mode as low as 20 µA[2] per button
❐ Deep sleep current: 100 nA
■ Industrial temperature range: –40 °C to + 85 °C
■ 48-pin QFN package (6 × 6 × 0.6 mm)
Overview
The CY8CMBR2016 CapSense Express capacitive touch
sensing controller incorporates several innovative features to
save time and money to quickly enable a capacitive touch
sensing user interface in your design. It is a hardware
configurable device and does not require any software tools,
firmware coding or device programming. This device is enabled
with Cypress's revolutionary SmartSense™ auto-tuning
algorithm. SmartSense™ auto-tuning ends the need to manually
tune the user interface during development and production
ramp. This speeds the time to volume and saves valuable
engineering time, test time and production yield loss.
The device supports up to 16 capacitive touch buttons that can
be organized in any format, such as a matrix array. With its
backward compatible key scan interface, it can enable users to
achieve quick-to-market (retrofit) designs in large keypad
applications such as fire alarm control panels, security systems,
and door locks. Any application that requires up to 16 CapSense
buttons can utilize CY8CMBR2016.
The wide operating range of 1.71 V to 5.5 V enables unregulated
battery operation, further saving component cost. This device
supports ultra low-power consumption in both run mode and
deep sleep mode to stretch battery life. In addition, this device
also supports many advanced features, which enhance the
robustness and user interface of the end solution. Some of the
key advanced features include Noise Immunity and FSS. Noise
Immunity improves the immunity of the device against radiated
and conducted noise, such as audio and radio frequency (RF)
noise. FSS provides robust sensing even with closely spaced
buttons. FSS is a critical requirement in small form factor
applications.
The CY8CMBR2016 provides three different host interface
communication modes. These include the industry standard host
interface protocols such as Key Scan Interface and Truth Table
Interface. These two protocols reuse existing host processor
firmware leading to easy conversion of existing mechanical
buttons to CapSense. The third host interface communication is
the Encoded GPO Interface with a 4-bit output, which minimizes
the number of pins required for a button output. These three
outputs are configurable which helps provide a wide variety of
device usage in multiple applications.
Serial Debug Data output gives the critical information about the
design, such as button Cp and raw counts. This further helps in
production line testing.
Notes
1. Supply variation should not be more than 5% for proper CapSense operation
2. Power consumption calculated with 250 ms scan time, 2% touch time and CP of each button < 19 pF.
Cypress Semiconductor Corporation • 198 Champion Court
Document Number: 001-67921 Rev. *C
• San Jose, CA 95134-1709 • 408-943-2600
Revised October 31, 2012
Free Datasheet http://www.datasheet4u.com/
1 page  
In Schematic 1, CY8CMBR2016 is configured as follows:
■ 16 CapSense buttons
■ Key Scan Interface
■ Continuous scan mode
■ High sensitivity for all buttons
■ FSS enabled
■ Button Auto Reset disabled
■ Serial Debug Data Out disabled
■ DC buzzer output
■ Reset button
■ Interrupt line output
CY8CMBR2016
Document Number: 001-67921 Rev. *C
Page 5 of 28
5 Page 
CY8CMBR2016
Figure 8. Button Auto Reset
Auto Reset period
Button is touched for more
than the Auto Reset period
Button
Output
Output is not driven
after Auto Reset period
Output Select
■ One among the three output interfaces defined earlier in the
section can be selected by the hardware configuration on the
OUT_SEL pin. Refer Table 18 in Appendix on page 26 for pin
configuration details.
■ Only one of the three output interfaces can be used at a given
time.
Scan Rate
■ 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 Power
Consumption and Device Operating Modes on page 15.
■ The device scan rate is defined by the hardware configuration
on the SCAN pin. Refer Table 18 in Appendix on page 26 for
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 CY8CMBR2016 Design Guide, section 5
for power calculations.
Sensitivity
■ 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”.
■ Sensitivity can be controlled by the hardware configuration on
the SENSITIVITY pin. For details, refer to Table 18 in Appendix
on page 26.
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 11), then the corresponding bit in the button mask is set,
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 Figure 9. CS1 failure
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, Figure 10 shows the System Diagnostics output
when CS1, CS3 and CS15 fail the POST.
Figure 9. System Diagnostics of Disabled Button - Scenario 1
Document Number: 001-67921 Rev. *C
Page 11 of 28
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet CY8CMBR2016.PDF ] | |
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