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參數(shù)資料
| 型號： | MIC3000BML TR |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 14/58頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX OPTICAL MANAGEMENT 24MLF |
| 標準包裝： | 1,000 |
| 類型： | 收發(fā)器 |
| 電源電壓： | 3 V ~ 3.6 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-VFQFN 裸露焊盤，24-MLF? |
| 供應(yīng)商設(shè)備封裝： | 24-MLF?（4x4） |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | MIC3000BMLTR MIC3000BMLTR-ND |
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October 2004
21
M9999-101204
MIC3000
Micrel
Diode Faults
The MIC3000 is designed to respond in a failsafe manner to
hardware faults in the temperature sensing circuitry. If the
connection to the sensing diode is lost or the sense line is
shorted to VDD or ground, the temperature data reported by
the A/D converter will be forced to its full-scale value (+127°C).
The diode fault flag, DFLT, will be set in OEMCFG1, TXFAULT
will be asserted, and the high temperature alarm and warning
flags will be set. The reported temperature will remain +127°C
until the fault condition is cleared. Diode faults may be reset
by toggling TXDISABLE, as with any other fault. Diode faults
will not be detected at power up until the first A/D conversion
cycle is completed. Diode faults are not reported while
TXDISABLE is asserted.
Temperature Compensation
Since the performance characteristics of laser diodes and
photodiodes change with operating temperature, the MIC3000
provides a facility for temperature compensation of the A.P.C.
loop setpoint, laser modulation current, bias current fault
comparator threshold, and bias current high alarm flag thresh-
old. Temperature compensation is performed using a look-up
table (LUT) that stores values corresponding to each mea-
sured temperature over a 128°C span. Four identical tables
reside at serial address A4h as summarized in Table 11. The
range of temperatures spanned by the tables is program-
mable via the LUTOFF register. Each table entry is a signed
twos complement number that is used as an offset to the
parameter being compensated. The default value of all table
entries is zero, giving a flat response.
The A/D converter reports a new temperature sample each
tCONV. This occurs at roughly 10Hz. To prevent temperature
oscillation due to thermal or electrical noise, sixteen succes-
sive temperature samples are averaged together and used to
index the LUTs. Temperature compensation results are
therefore updated at 16
∞t
CONV intervals, or about 1.6 sec-
onds. This can be expressed as shown in Equation5.
T
TT
T
16
COMPm
nn 1
n 2
n 15
=
+
+
++
+
(5)
Each time an updated average value is acquired, a new offset
value for the APC setpoint is read from the corresponding
look-up table (see Table 12) and transferred to the APC
circuitry. This is illustrated in Equation 6. In a same way, new
offset values are taken from similar look-up tables (see Table
13 and Table 14), added to the nominal values and trans-
ferred into the modulation and fault comparator DACs. The
bias current high alarm threshold, is compensated using a
fourth look-up table (see Table 15). This compensation
happens internally and does not affect any host-accessible
registers.
COUNTER
tFLTTMR
FLTTMR
SATURATION_FAULT
Saturation Detector
VCOMP
5% VDDA
95% VDDA
VDDA
Figure 9. Saturation Detector
FLTDAC
LOSFLT
OEMCFG3
LOS
DIS
CNTRL
LOS
VRX
RXLOS
VDDA
Figure 10. RXLOS Comparator Logic
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