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기능 ADA and MASK Timing on WM9712
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w
WAN-0143
ADA and MASK Timing on WM9712
INTRODUCTION
WM9712 SETUP
This applications note has been created to detail the timing of the MASK and ADA (ADC Data
Available) signals on the WM9712 device. This applications note should be used in conjunction with
the latest WM9712 datasheet.
The WM9712 has many additional functions to aid the design of portable applications. Pin 47 of the
device can be configured for either MASK input, ADA output or standard GPIO functionality. The
MASK function can be used to pause and control auxiliary ADC conversions. The ADA function can
be used to indicate when data becomes available from the auxiliary ADC. The timing associated
with both signals is detailed in the following sections of this document.
The WM9712 device must be configured to setup the function of pin 47. The three possible setups
are:
MASK Input Function
ADA Function
General GPIO
To set the device into one of the three above modes the following configurations should be used.
PIN 47 MODE
MASK
ADA
GPIO
REGISTER 56H BIT 4 SETTING
(GPIO FUNCTION SELECT)
1
1
0
Table 1 WM9712 Pin 47 Configuration
REGISTER 4CH BIT 4 SETTING
(PIN DEFINED AS INPUT OR OUTPUT)
1 (Input)
0 (Output)
1 or 0 (GPIO can be Input or Output)
MASK FUNCTION
Sources of glitch noise, such as the signals driving an LCD display, may feed through to the
touchscreen plates and affect measurement accuracy. In order to minimise this effect, a signal may
be applied to MASK (pin 47) to delay or synchronise the sampling of any input to the ADC. The effect
of the MASK signal depends on the MSK[1-0] bits of register 78h, as described below.
MSK[1-0]
00
01
10
11
EFFECT OF SIGNAL ON MASK PIN
MASK has no effect on conversions GPIO input disabled (default)
Static; ‘hi’ on MASK pin stops conversions, ‘lo’ has no effect.
Edge triggered; rising or falling edge on MASK pin delays conversions
by an amount set in the DEL[3-0] register. Conversions are asynchronous to
the MASK signal.
Synchronous mode; conversions wait until rising or falling edge on MASK
initiates cycle; screen starts to be driven when the edge arrives, the
conversion sample being taken a period set by DEL[3-0] after the edge.
Table 2 Controlling the MASK Feature
WOLFSON MICROELECTRONICS plc
www.wolfsonmicro.com
March 2004, Rev 1.0.
Copyright 2004 Wolfson Microelectronics plc




WAN0143 pdf, 반도체, 판매, 대치품
WAN_0143
ALTERNATIVE MASK FUNCTION
When MASK = 11, synchronous mode, conversions are commanded on the rising and falling edges
of MASK input signal. However, there is an alternative operation which allows a pulse to be applied
to the MASK pin resulting in only one conversion taking place. In this setup the edges of the pulse
are too close together to allow two separate conversions to be commanded. Figure 3 details this
operation and the timing associated.
t PULSE
MASK
Frames
(SYNC)
AUXADC Conversion
(MASK = 11)
t DEL
t DEL
Conv
t DEL
Conv
Figure 3 MASK PULSE delay timings (tDEL = 2 frames)
PARAMETER
MASK Pulse Width
Frame Delay set by register 76h
SYMBOL
tPULSE
tDEL
MIN
100ns
0
TYP
MAX
< tDEL
288
UNIT
ns
frames
ADA TIMING
Whenever data becomes available from the touchpanel ADC, the internal ADA signal goes high and
remains high until the data has been read from register 7Ah (if SLEN = 0) or until it has been sent out
on an AC-Link slot (if SLEN = 1).
If ADA is configured to be output on pin 47 the timing associated with this signal will be as follows.
BCLK
SYNC
ADA
t ADA
Figure 4 ADA Timings
t ADA
PARAMETER
Delay from SYNC to ADA
SYMBOL
tADA
MIN
TYP
200ns
MAX
UNIT
ns
w
Rev 1.0 March 2004
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ADA and MASK Timing on WM9712

Wolfson Microelectronics plc
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