参数资料
| 型号： | DS1861E+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 19/25页 |
| 文件大小： | 0K |
| 描述： | IC LASR CTRLR 1CHAN 5.5V 14TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 96 |
| 类型： | 激光二极管控制器（光纤） |
| 通道数： | 1 |
| 电源电压： | 2.85 V ~ 5.5 V |
| 电流 - 电源： | 5mA |
| 工作温度： | -40°C ~ 95°C |
| 封装/外壳： | 14-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 14-TSSOP |
| 包装： | 管件 |
| 安装类型： | 表面贴装 |
Full Laser Control with Fault Management
Detailed Register Description Conventions
Name of Row
? Name of Byte... < Write Access >< Volatility >< Power-
Up/Factory Default Value >
0. Name of bit 0.....Bit 0 Description
1. Name of bit 1.....Bit 1 Description
2 to 7. Bit names.....Bit 2 to 7 Descriptions
Write Access: W is write-only access, R is read-only
access, and R/W is read/write access. A password may
be required for write access on R/W registers. See the
memory map for complete access code descriptions.
Volatility: V is volatile (SRAM), NV is nonvolatile (EEPROM).
Power-Up/Factory Default Value: For SRAM registers,
this value is always the power-up value. For EEPROM
registers, this is the factory default value. These can be
permanently modified by entering the password and
writing the register. N/A is used for hardware-depen-
dent values, such as alarm flags.
Password Entry
? Status <R><V><N/A, depends on power-up condi-
tion>
0. HBIAS Alarm.....High Bias-Current Alarm. This
flag is high when I BIASSET ≥ HBIAS Alarm
Threshold. This flag is updated every 4μs or
16μs depending on the state of the convergence
5. LTXP Shutdown....This flag goes high when a
LTXP safety fault is generated and LTXP Enable
is high. LTXP Shutdown goes low with POA or a
falling edge of TX-D, providing the safety fault is
no longer present.
6. HTXP Shutdown....This flag goes high when a
HTXP safety fault is generated and HTXP Enable
is high. HTXP Shutdown goes low with POA or a
falling edge of TX-D, providing the safety fault is
no longer present.
7. Shutdown Flag....This flag is high when any of
the three latched safety faults are high ( HBIAS
Shutdown, LTXP Shutdown, or HTXP Shutdown ),
and it remains high after the individual flag’s are
reset until fault reset time has elapsed.
? PWE High & Low ....<R/W><V><FFFFh> Until the cor-
rect 32-bit password is written to PWE, the PWE bytes
are the only locations that can be written. PWE should
be written to a value other than the password once the
device’s configuration has been updated to prevent the
password from being read from PWE. After a power
cycle these locations will each be reset to FFFFh.
APC Config
? APC ....<R/W><NV><00h> Sets the desired value of
the feedback current into the I BMD pin. The 3 MSB’s
determine the input GAIN value according to this table:
algorithm. Programming HBIAS threshold byte to
zero disables the HBIAS Alarm.
1. LTXP Alarm.....Low Transmitted Power Alarm.
This flag is high when the I BMD current drops
below the value set by the LTXP threshold. This
flag is updated every 16μs. Programming LTXP
threshold to zero disables this flag. This flag willl
APC<7:5>
000
001
010
011
1xx
GAIN
1
2
4
8
16
be high when TX-D = 1 unless the alarm has
been disabled.
2. HTXP Alarm....High Transmitted Power Alarm.
This flag is high when the I BMD current rises
above the value set by the HTXP threshold. This
flag is updated every 16μs. Programming HTXP
Threshold to zero disables this flag.
3. POA....Analog Power-On Reset Alarm (V CC
Power Good). This flag is set when V CC < V POA .
4. HBIAS Shutdown....This flag goes high when a
HBIAS safety fault is generated and HBIAS
Enable is high. HBIAS Shutdown goes low with
POA or a falling edge of the TX-D pin, providing
the safety fault is no longer present.
The remaining 5 LSBs determine the I BMD current set-
point (I SET ) assuming a GAIN of 1. The formula for the
I BMD current setpoint with the gain is then given by:
I SET = 1.525μA GAIN (APC <4:0> + 32)
If values greater than 10011111b (9Fh) are pro-
grammed into the APC register, the DS1861 will clamp
I SET to its maximum value, equivalent to if the register
was set to 10011111b.
? ER (N) ....<R/W><NV><1Ch> Sets the gain ( N ) on the
measured excitation current used to generate I MODSET .
This sets the extinction ratio of the system. Higher N
values increase the excitation ratio. The MSB of this
register (RSEL) is a flag that selects a high (RSEL = 1)
or low (RSEL = 0) range for N . The 7 LSBs of the regis-
ter determine the actual N code. The value of N can be
calculated by the following equation:
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