CY8CMBR2016-24LQXI Cypress Semiconductor, CY8CMBR2016-24LQXI Datasheet - Page 8

• 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

Configuring the CY8CMBR2016
The CY8CMBR2016 device features are configured using
external resistors. The resistors on the hardware configurable
pins are determined by the device upon power-on. The
on page 26
external resistor configurations.
Device Features
Table 2. Device Feature List
CapSense Buttons
■
■
■
■
Document Number: 001-67921 Rev. *C
16 CapSense Buttons Mechanical button/keypad
Flanking Sensor
Suppression (FSS)
Key Scan Interface
Truth Table Output
4-bit Encoded Output
Button Auto Reset
Scan/Sleep Rate
Configurable Sensi-
tivity
Deep Sleep
System Diagnostics
Device supports up to 16 CapSense Buttons.
Ground the CSx Pin to disable CapSense input.
2.2 nF (± 10%) capacitor should be connected on C
proper CapSense operation.
The parasitic capacitance (C
40 pF for proper CapSense operation.
Feature
gives the matrix of features enabled using different
Mechanical matrix replacement
Fewer pins needed to output button
Configures the device based on power
Supports for production testing and
replacement
Helps in distinguishing closely spaced
buttons
Easy to decode truth table based
output mode
status
Prevents buttons from getting stuck
during run time
needs
Selects the sensitivity for the system –
minimum change in capacitance to be
detected
Reduce power consumption by
hibernating the device
debugging
P
) of each button must be less than
Description/Use
MOD
Appendix
pin for
SmartSense Auto-Tuning
■
■
■
■
Flanking Sensor Suppression (FSS)
■
■
■
Key Scan Interface
■
■
■
■
■
■
■
Table 3. Key Scan interface Selection based on # of Buttons
(>12)
(<=12) && (>8)
(<=8) && (>4)
(<=4)
Device supports auto-tuning of CapSense button parameters.
No manual tuning required; all parameters are automatically
tuned by the device.
Compensates printed circuit board (PCB) variations, device
process variations, and PCB vendor changes.
Ensures portability of the user interface design.
Helps to distinguish closely spaced buttons.
Also used in situations when a button can produce opposite
effects. For example, an interface with two buttons for
brightness control (UP or DOWN).
FSS action can be explained for the following different
scenarios:
❐
❐
Mimics legacy mechanical keypads - Four SCAN lines (I/P) and
four READ lines (O/P)
Reads the SCAN lines and updates the READ lines based on
the button status (Refer to
‘Plug' n 'Play' replacement for mechanical keypads.
When buttons are disabled or found to be invalid,
identifying the scan and read lines.
When the SCAN lines are not used, they should be connected
to V
OUT0 to OUT3 in the pin out form the SCAN lines and OUT4
to OUT7 form the READ lines
Refer
No. of Buttons
When only one button is touched, it is reported as ON.
When more than one button is detected as ON and previously
one of those buttons was touched, then the previously
touched button is reported as ON. (Refer to
DD
Figure 6
for SCAN line waveform details.
4 × 4
3 × 4
2 × 4
1 × 4
SCAN × READ Lines
Figure
5).
CY8CMBR2016
OUT0 to OUT3
OUT0 to OUT2
OUT0 to OUT1
OUT0
Figure
Scan Lines
Table 3
Page 8 of 28
4.)
helps