SX8663 datasheet(28/64 Pages) SEMTECH

28 / 64 page

ADVANCED COMMUNICATIONS & SENSING

Rev5 4

th August 2011

www.semtech.com

SX8663

Capacitive Button Matrix (up to 36) and Proximity Controller

with Individual LED Drivers and Buzzer Output

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0/0

Table 8

Intensity index vs. PWM pulse width (inverted polarity)

3.15.4 Tri-State Multiplexing (TSM)

SX8663 can support up to 36 individual LEDs ie one per matrix key. To make this possible with the limited GPIOs

available a Tri-State Multiplexing driver has been implemented on chip and a specific LED matrix connection

must be followed for correct operation.

Figure 32 Tri-State Multiplexing Schematics (DMKx = LED of button MKx, Cf Figure 50)

Whenever set to GPO with Autolight ON, GPIO0-6 (GPIO0-5 if PK is enabled) are automatically configured for

TSM operation.

If only PS is enabled the matrix is reduced to 6x5 LEDs, DMK31-36 can be removed and GPIO6 is available.

If both PS and PK are enabled the matrix is reduced to 5x5 LEDs, DMK26-36 can be removed and GPIO6 is

automatically used for PK independent LED feedback (if Autoligth ON, else can be controlled by the host).

In addition to the standard individual button touch/release, if PS is enabled and ProxCfg[4:2] != 000 the remaining

DMKx (6x5 or 5x5) will partially turn ON when proximity is detected as illustrated in figure below.

SX8663 数据表(PDF) 28 Page - Semtech Corporation

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