sx8723c Semtech Corporation, sx8723c Datasheet - Page 20

• Manufacturer Part Number: sx8723c
• Description: Zoomingadc For Sensing Data Acquisition
• Manufacturer: Semtech Corporation

Revision 1.01
© Semtech
7.1.3 PGA & ADC Enabling
Depending on the application objectives, the user may enable or bypass each PGA stage. This is done according to the
word Enable and the coding given in
7.2 ZoomingADC Registers
The system has a bank of eight 8-bit registers: six registers are used to configure the acquisition chain (RegAcCfg0 to
RegAcCfg5), and two registers are used to store the output code of the analog-to-digital conversion (RegAcOutMsb &
Lsb).
Table 8.
Conversion (ADC) Result
(1)
(2)
ADVANCED COMMUNICATIONS & SENSING
Register Name
RegACOutLsb
RegACOutMsb
RegACCfg0
Default values:
RegACCfg1
Default value:
RegACCfg2
Default value:
RegACCfg3
Default value:
RegACCfg4
Default value:
RegACCfg5
Default value:
(r = read; w = write; rw = read & write)
Out: (r) digital output code of the analog-to-digital converter. (MSB = Out[15])
Start: (w) setting this bit triggers a single conversion (after the current one is finished). This bit always reads back 0.
Periferal Registers to Configure the Acquisition Chain (AC) and to Store the Analog-to-Digital
Bit position
7
0,
0,
Pga1Gain
0,
Note 11
Note 16
Start
Note 2
Busy
0
-
00,
IbAmpAdc
11,
January 2011
SetFs
Note 10
Note 7
6
0,
Note 17
Def
SetNelconv
(RegACCfg1[3:0])
01,
Table
Note 3
Enable
5
XXX0
XXX1
XX0X
XX1X
X0XX
X1XX
0XXX
1XXX
Table 7. ADC and PGA Enabling
7. To reduce power dissipation, the ADC can also be inactivated while idle.
00,
IbAmpPga
11,
Pga2Gain
Note 12
Note 8
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4
Out[15:8]
Out[7:0]
Note 1
ZoomingADC for sensing data acquisition
0001100,
0000000,
00000,
3
PGA1 disabled
PGA2 disabled
PGA3 disabled
PGA1 enabled
PGA2 enabled
PGA3 enabled
ADC disabled
010,
ADC enabled
Pga3Offset
Pga3Gain
SetOsr
Amux
Block
Note 4
Note 18
Note 13
Note 15
2
0000,
0000,
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Pga2Offset
Enable
Note 14
Note 9
1
Continuous
0,
SX8723C
Note 5
DATASHEET
0
0,
0,
Note 19
Vmux
Note 6
-