参数资料
型号: MC34708VM
厂商: Freescale Semiconductor
文件页数: 82/159页
文件大小: 0K
描述: IC POWER MANAGEMENT 206MAPBGA
标准包装: 160
应用: 通用
电源电压: 1.8 V ~ 4.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 206-LFBGA
供应商设备封装: 206-MAPBGA(13x13)
包装: 托盘
Functional Block Description
Table 75. Touch Screen Action Select
TSSELx[1:0]
00
01
10
11
Signals Sampled
Dummy to discharge TSREF cap
X plate
Y –plate
Contact
The touch screen readings can be repeated, as in the following example readout sequence, to reduce the interrupt rate and to
allow for easier noise rejection. The dummy conversion inserted between the different readings allows the references in the
system to be pre-biased for the change in touch screen plate polarity. It will read out as ‘0’.
A touchscreen reading will take precedence over an ADC sequence. If an ADC reading is triggered during a touchscreen event,
the ADC sequence will be overwritten by the Touchscreen data.
The first Touch screen conversion can be delayed from 0 (default) to 600 ? s by programming the TSDLY1[3:0] bits. The
TSDLY2[3:0] controls the delay between each of the touch screen conversions from 0 to 600 ? s. TSDLY[2:0] sets the delay after
the last address is converted. TSDLY1, 2, and 3 are set to 0 by default.
Table 76. TSDLYx[3:0]
TSDLYx[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
To perform a touch screen reading, the processor must do the following:
Delay in uS
0
40
80
120
160
200
240
280
320
360
400
440
480
520
560
600
?
?
?
?
?
?
?
Enable the touch screen with TSEN
Select the touch screen sequence by programming the TSSEL0-TSSEL7 SPI bits.
Program the TSSTOP[2:0]
Program the delay between the conversion via the TSDLY1 and TSDLY2 settings.
Trigger the ADC via the TSSTART SPI bit
Wait for an interrupt indicating the conversion is done TSDONEI
And then read out the data in the ADRESULTx registers
MC34708
Analog Integrated Circuit Device Data ?
Freescale Semiconductor
82
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