參數(shù)資料
型號(hào)： DS1862AB+T&R
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PBGA25
封裝： 5 X 5 MM, ROHS COMPLIANT, CSBGA-25
文件頁(yè)數(shù)： 11/42頁(yè)
文件大?。?/td> 586K
代理商： DS1862AB+T&R
DS1862A
XFP Laser Control and Digital Diagnostic IC
______________________________________________________________________________________
19
Internal Calibration
The DS1862A has two means for scaling an analog
input to a digital result. The two devices alter the gain
and offset of the signal to be calibrated. All of the
inputs except internal temperature have unique regis-
ters for both the gain and the offset that can be found in
Table 04h. See the table below for a complete descrip-
tion of internal calibration capabilities including right-
shifting for all monitor channels.
To scale a specific input’s gain and offset, the relation-
ship between the analog input and the expected digital
result must be known. The input that would produce a
corresponding digital result of all zeroes is the null
value (normally this input is GND). The input that would
produce a corresponding digital result of all ones is the
full-scale (FS) value minus one LSB. The FS value is
also found by multiplying an all ones digital value by
the weighted LSB. For example, a digital reading is 16
bits long, assume that the LSB is known to be 50μV,
then the FS value would be 216 x 50μV = 3.2768V.
A binary search can be used to find the appropriate
gain value to achieve the desired FS of the converter.
Once the gain value is determined, then it can be
loaded into the appropriate channels’ Gain register.
This requires forcing two known voltages on to the
monitor input pin. For best results, one of the forced
voltages should be the NULL input and the other
should be 90% of FS. Since the LSB of the least signifi-
cant byte in the digital reading register is known, the
expected digital results are also known for both the null
and FS value inputs. Figure 9 describes the hysteresis
built into the DS1862A’s LUT functionality.
With the exception of BMD, which can source or sink
current, all monitored channels are high impedance
and are only capable of directly measuring a voltage. If
other measured quantities are desired, such as light,
frequency, power, current, etc., they must be converted
to a voltage. In this situation the user is not interested in
voltage measurement on the monitored channel, but
the measurement of the desired parameter. Only the
relationship between the indirect measured quantity
(light, frequency, power, current, etc.) to the expected
digital result must be known.
An example of gain scaling using the recommended
binary search procedure is provided with the following
pseudo code.
To help will the computation, two integers need to be
defined: count 1 and count 2. CNT1 = NULL / LSB and
CNT2 = 90%FS / LSB. CLAMP is the largest result that
can be accommodated.
Table 8. Temperature Conversion
Examples
MSB (BIN)
LSB (BIN)
TEMPERATURE (°C)
01000000
00000000
+64
01000000
00001000
+64.03215
01011111
00000000
+95
11110110
00000000
-10
11011000
00000000
-40
Table 9. Internal Calibration Capabilities
SIGNAL
INTERNAL
SCALING
INTERNAL
OFFSET
RIGHT-
SHIFTING
Temperature
—
x
—
VCC2/3
x
—
IBIASMON
x
RSSI (RX-P)
x
AUX1MON
x
AUX2MON
x
BMD (TX-P)
x
M6
M5
M4
M3
M2
M1
2
4
6
8
10
12
TEMPERATURE (
°C)
MEMORY
LOCATION
INCREASING
TEMPERATURE
DECREASING
TEMPERATURE
Figure 9. Lookup Table Hysteresis
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