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參數資料
| 型號： | WAN-0143 |
| 廠商： | Wolfson Microelectronics |
| 英文描述： | ADA and MASK Timing on WM9712 |
| 中文描述： | ADA和面具的WM9712時間 |
| 文件頁數： | 4/6頁 |
| 文件大小： | 60K |
| 代理商： | WAN-0143 |
WAN_0143
ALTERNATIVE MASK FUNCTION
w
Rev 1.0 March 2004
4
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.
MASK
Frames
(SYNC)
AUXADC Conversion
(MASK = 11)
Conv
t
DEL
t
PULSE
t
DEL
Conv
t
DEL
Figure 3 MASK PULSE delay timings (t
DEL
= 2 frames)
PARAMETER
SYMBOL
t
PULSE
t
DEL
MIN
100ns
TYP
MAX
< t
DEL
288
UNIT
ns
frames
MASK Pulse Width
Frame Delay set by register 76h
0
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
t
ADA
Figure 4 ADA Timings
PARAMETER
SYMBOL
t
ADA
MIN
TYP
200ns
MAX
UNIT
ns
Delay from SYNC to ADA
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