参数资料
| 型号： | DS1862B+T&R |
| 厂商： | Maxim Integrated |
| 文件页数： | 18/43页 |
| 文件大小： | 0K |
| 描述： | IC LASR CTRLR 7CHAN 5.5V 25CSBGA |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 激光二极管控制器（光纤） |
| 数据速率： | 10Gbps |
| 通道数： | 7 |
| 电源电压： | 2.9 V ~ 5.5 V |
| 电流 - 电源： | 3mA |
| 工作温度： | -40°C ~ 100°C |
| 封装/外壳： | 25-TFBGA，CSPBGA |
| 供应商设备封装： | 25-BGA（5x5） |
| 包装： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
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XFP Laser Control and Digital Diagnostic IC
fault functionality, current on the BIASSET pin is moni-
tored by the DS1862 to control the HIGH BIAS quick-
trip alarm. Similar to TX-P, the RSSI pin is used to
measure the received power, RX-P.
Measuring Voltage Quantities
using AUX1MON and AUX2MON
AUX1MON and AUX2MON are auxiliary monitor inputs
that may be used to measure additional parameters.
AUX1/2MON feature a user-selectable register that
determines the measured value’s units (i.e., voltage,
current, or temperature). In addition to indicating units,
some of the 4-bit op codes, in Table 5, also place the
part in special modes used for alarms and faults inter-
nally. Whichever units’ scale is selected, the DS1862 is
only capable of measuring a positive voltage quantity,
therefore internal or external calibration may be
Table 5. AUX1/2MON Functionality
Selection (Unit Selection)
required to get the binary value to match the measured
quantity. A table of acceptable units and/or their corre-
sponding user-programmable 4-bit op code is provid-
ed below.
Alarms and Warning Flags
Based on Monitor Channels
All of the monitor channels feature alarm and warning
flags that are asserted automatically as user-pro-
grammed thresholds are internally compared with mon-
itor channel results. Flags may be set, which, if not
masked, will generate an interrupt on the INTERRUPT
pin or generate a safety fault. Whenever V CC2/3 ,
AUX2MON, AUX1MON, RSSI, and internal temperature
go beyond their threshold trip points and the corre-
sponding mask bit is 0, an interrupt is generated on the
INTERRUPT pin and a corresponding warning or alarm
flag is set. Similarly, a safety fault occurs whenever
BMD or BIASSET go beyond threshold trip points.
When this happens, the FETG pin immediately asserts
and BIASSET and MODSET currents are shut down.
VALUE
0000b
0001b
0010b
0011b
DESCRIPTION OF AUX1/2MON INTENDED USE
(UNITS OF MEASURE)
Auxiliary monitoring not implemented
APD bias voltage (16-bit value is voltage in units
of 10mV)
Reserved
TEC current (mA) (16-bit value is current in units
of 0.1mA)
Monitor Channel Conversion Example
Table 6 provides an example of how a 16-bit ADC code
corresponds to a real life measured voltage using the
factory-set calibration on either RSSI or IBIASMON. By
factory default, the LSB is set to 38.147μV.
Table 6. A/D Conversion Example
MSB (BIN) LSB (BIN) VOLTAGE (V)
0100b
Laser temperature (same encoding as module
temperature)
11000000
10000000
00000000
10000000
1.875
1.255
0101b
Laser wavelength
0110b
0111b
1000b
1001b
1010b
+5V supply voltage (encoded as primary voltage
monitor)
+3.3V supply voltage (encoded as primary
voltage monitor)
+1.8V supply voltage (encoded as primary
voltage monitor) (V CC2 )
-5.2V supply voltage (encoded as primary voltage
monitor)
+5V supply current (16-bit value is current in
0.1mA)
To calculate V CC2 , V CC3 , AUX1MON, or AUX2MON,
convert the unsigned 16-bit value to decimal and multi-
ply by 100μV.
To calculate the temperature (internal), treat the two’s-
complement value binary number as an unsigned
binary number, then convert it to decimal and divide by
256. If the result is grater than or equal to 128, subtract
256 from the result.
Temperature: high byte = -128°C to +127°C signed;
low byte = 1/256°C.
1101b
+3.3V supply current (16-bit value is current in
0.1mA)
Table 7. Temperature Bit Weights
S 2 6 2 5 2 4 2 3 2 2 2 1
2 0
1110b
+1.8V supply current (16-bit value is current in
0.1mA)
2 -1
2 -2
2 -3
2 -4
2 -5
—
—
—
1111b
-5.2V supply current (16-bit value is current in
0.1mA)
18
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