參數(shù)資料
型號(hào)： AD7147A-1ACBZ-RL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 33/69頁(yè)
文件大小： 0K
描述： IC CDC 13CH I2C W/RAM 25WLCSP
產(chǎn)品變化通告： 8mm Carrier Tape Changes 28/Feb/2012
標(biāo)準(zhǔn)包裝： 10,000
系列： CapTouch™
類型： 電容數(shù)字轉(zhuǎn)換器
分辨率（位）： 16 b
采樣率（每秒）： 250k
數(shù)據(jù)接口： I²C，串行
電壓電源： 單電源
電源電壓： 2.6 V ~ 3.6 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 25-UFBGA，WLCSP
供應(yīng)商設(shè)備封裝： 25-WLCSP
包裝： 帶卷 (TR)
AD7147A
Rev. B | Page 38 of 68
POWER-UP SEQUENCE
To power up the AD7147A, use the following sequence when
initially developing the AD7147A and microprocessor serial
interface:
1.
Turn on the power supplies to the AD7147A.
2.
Write to the Bank 2 registers at Address 0x080 through
Address 0x0DF. These registers are contiguous; therefore, a
sequential register write sequence can be applied.
Note that the Bank 2 register values are unique for each
application. Register values come from characterization of
the sensor in the application. The characterization process
is outlined in the AN-929 Application Note, available from
Analog Devices.
3.
Write to the Bank 1 registers at Address 0x000 through
Address 0x007, outlined as follows. These registers are
contiguous; therefore, a sequential register write sequence
can be applied (see Figure 49 and Figure 54).
Caution: At this time, Address 0x001 must remain set
to a default value of 0x0000 during this contiguous write
operation.
Register values:
Address 0x000 = 0x82B2
Address 0x001 = 0x000
Address 0x002 = 0x3230 (depends on number of
conversion stages used)
Address 0x003 = 0x419
Address 0x004 = 832
Address 0x005 = interrupt enable register (depends on
required interrupt behavior)
Address 0x006 = interrupt enable register (depends on
required interrupt behavior)
Address 0x007 = interrupt enable register (depends on
required interrupt behavior)
4.
Write to the Bank 1 register, Address 0x001 = 0x0FFF
(depends on number of conversion stages used).
5.
Read back the corresponding interrupt status register at
Address 0x008, Address 0x009, or Address 0x00A. This is
determined by the interrupt output configuration, as
explained in the Interrupt Output section.
Note that the specific registers required to be read back
depend on each application. For buttons, the interrupt
status registers are read back while other sensors read data
back from the AD7147A according to the slider or wheel
algorithm requirements. Analog Devices can provide this
information after the user develops the sensor board.
6.
Repeat Step 5 every time INT is asserted.
FIRST CONVERSION SEQUENCE
CONVERSION
STAGE
0
CONVERSION STAGES DISABLED
1
2
3
4
5
678
9
10
11
0
1
2
9
10
11
012
910
11
0
1
SECOND CONVERSION
SEQUENCE
THIRD CONVERSION
SEQUENCE
POWER
HOST
SERIAL
INTERFACE
AD7147A INT
0
77
27-
05
8
Figure 58. Recommended Start-Up Sequence
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