XR18910 Datasheet, PDF (6/19 Pages) Exar Corporation – 8:1 Sensor Interface Analog Front End

XR18910
Electrical Characteristics (Continued)
Table 1. Register List
Reg No.
R/
Name
Function
W/
Hex Dec
C
0x00 0 NOP
No operation
C
Reset
0x01 1 SW_RESET Software reset
C
Read ID
0x02 2 DEVICE_ID
Read Device ID
R
Read HW & SW
0x03 3 VERSION_ID
R
version numbers
Sleep in/out
0x04 4
SLEEP_OUT_ Normal operating
REG
mode, system active
C
SLEEP_IN_
0x05 5
Sleep Mode
C
REG
Basic Config
0x06 6 Gain
Gain select
R/W
0x07 7 LDO
LDO Settings
R/W
LDO Current
0x08 8
LDO Current Sense
C
Sense Select
Channel Switch (Input MUX Select)
0x10 16 Select_Input_1 Select Channel 1
C
0x12 18 Select_Input_2 Select Channel 2
C
0x14 20 Select_Input_3 Select Channel 3
C
0x15 21 Select_Input_4 Select Channel 4
C
0x18 24 Select_Input_5 Select Channel 5
C
0x1A 26 Select_Input_6 Select Channel 6
C
0x1C 28 Select_Input_7 Select Channel 7
C
0x1E 30 Select_Input_8 Select Channel 8
C
Offset DAC Config
0x20 32 DAC1
0x22 34 DAC2
0x24 36 DAC3
0x25 37 DAC4
0x28 40 DAC5
0x2A 42 DAC6
0x2C 44 DAC7
0x2E 46 DAC8
Configures DAC offset
applied to Channel 1
R/W
Configures DAC offset
applied to Channel 2
R/W
Configures DAC offset
applied to Channel 3
R/W
Configures DAC offset
applied to Channel 4
R/W
Configures DAC offset
applied to Channel 5
R/W
Configures DAC offset
applied to Channel 6
R/W
Configures DAC offset
applied to Channel 7
R/W
Configures DAC offset
applied to Channel 8
R/W
Byte of
Parameter
Parameter
0
Default
Code
Power-up
Condition
Remark
N/A
Does not execute a function. NOP is used to
test successful I²C communication
0
N/A
Resets all registers to default values
2
[15:0]: report “8910” in
BCD
0x8910
[15:12]: reserved
2
[11:8]: Hardware version # N/A
[7:0]: Software version #
Instructs the XR18910 to report its device ID
8910 in binary form (1000 1001 0001 0000)
Initial H/W version number is ‘0’;
Initial S/W version number is ‘01.’
0
0
1
[2:0]: Gain select
[0]:LDO 3V, 2.65V
1
[1]:LDO disable
0
0
0
0
0
0
0
0
0
N/A
Active Puts the XR18910 into active mode. (wake up)
Puts the analog portion of the XR18910 into
sleep mode.
N/A
Active During sleep mode, the only I²C command
that can be received/processed is the
SLEEP_OUT command (0x04). All other
register addresses will be ignored.
0x00
0x00
N/A
Eight gain settings are selectable (from 2V/V
Gain = 2 to 760V/V), refer to the Gain Register Table
for more information.
Bit 0 controls the LDO voltage (0: 3V; 1: 2.65V).
Bit 1 (Sleep Mode only). Bit 1 controls whether
LDO = 3V _{the LDO shuts down or stays on during Sleep}
Mode. (0: Enable; 1: Disable). When the
XR18910 is active, the LDO is always on.
When on, the LDO current is sensed and a
proportional voltage is present at the output of
Off
the XR18910.
Current Sense Mode remains active until an input
select command is received by the XR18910.
Select +IN1, -IN1; Channel 1
Select +IN2, -IN2; Channel 2
Select +IN3, -IN3; Channel 3
N/A
Channel 1 Select +IN4, -IN4; Channel 4
is selected Select +IN5, -IN5; Channel 5
Select +IN6, -IN6; Channel 6
Select +IN7, -IN7; Channel 7
Select +IN8, -IN8; Channel 8
2
2
2
2
[10]: DAC Sign
2
[9:0]: DAC Range
2
2
2
0x00
0mV
offset
Bit 10 controls the sign of the DAC offset
voltage. Bits 9 thru 0 control the value of
the DAC offset voltage.
[10]: DAC Sign 0 = positive; 1 = negative
NOTE:
Register numbers not listed above have no function.
REV1A
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