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LTC3871 데이터시트(PDF) 15 Page - Linear Technology

부품명 LTC3871
상세설명  A 7-Bit Current DAC with PMBus Interface
PDF  24 Pages
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제조업체  LINER [Linear Technology]
홈페이지  http://www.linear.com
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LTC3871 데이터시트(HTML) 15 Page - Linear Technology

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LTC7106
15
Rev A
For more information www.analog.com
REGISTER COMMAND DETAILS
MFR_CHIP_CTRL
This register is for general chip control and status. Please
refer to Table 7 for each bit description.
Bits
Description
[7:4] Reserved
[3]
Timeout Status:
0 = No PMBus Timeout Occurred
1 = A Timeout Occurred
Writing a 1 to this bit will clear this bit
[2]
Write Protect for Margin Registers
0 = Write Allowed
1 = Writes Inhibited
[1]
Reserved
[0]
GPO, General Purpose Output
0 = GPO Pulls Open Drain to GND
1 = Hi-Z on GPO
MFR_DAC_CTRL
8-bit register to control the IDAC LSB current value and the
timer count for the slew rate control. Default value = 0x40.
Bits
Description
[7:6] Selector Range for IDAC Step Current:
b’00 = 0.25µA/Step, Range Low
b’01 = 1.0µA/Step, Nominal
b’10 = 4.0µA/Step, Range High
b’11 = Reserved
[5:0] Selector for Time in µs/Step
Default Value 0x00 = Max = 3584µs/Step
See Table 6 for Allowable Values
Only a power cycle, POR, will reset this register to prevent
unwantedimmediatecurrentchangesinIDAC.MFR_RESET
will not reset this register.
In addition, IDAC must be at 0x00 to change the current
range selector to prevent unwanted large swings in IDAC
current. The time step selector, bits [5:0], can be changed
at any time.
Table 5. Programmable Delay Per Current Step
Slew Rate Timer Clock (µs/Step)
[5:0]
[5:0]
[5:0]
0 0 0 0 0 0
= 3584 0 1 0 0 0 0
= 16
1 0 0 0 0 0
= 256
0 0 0 0 0 1
= 0.5
0 1 0 0 0 1
= 20
1 0 0 0 0 1
= 320
0 0 0 0 1 0
= 1.0
0 1 0 0 1 0
= 24
1 0 0 0 1 0
= 384
0 0 0 0 1 1
= 1.5
0 1 0 0 1 1
= 28
1 0 0 0 1 1
= 448
0 0 0 1 0 0
= 2.0
0 1 0 1 0 0
= 32
1 0 0 1 0 0
= 512
0 0 0 1 0 1
= 2.5
0 1 0 1 0 1
= 40
1 0 0 1 0 1
= 640
0 0 0 1 1 0
= 3.0
0 1 0 1 1 0
= 48
1 0 0 1 1 0
= 768
0 0 0 1 1 1
= 3.5
0 1 0 1 1 1
= 56
1 0 0 1 1 1
= 896
0 0 1 0 0 0
= 4.0
0 1 1 0 0 0
= 64
1 0 1 0 0 0
= 1280*
0 0 1 0 0 1
= 5.0
0 1 1 0 0 1
= 80
1 0 1 0 0 1
= 1280
0 0 1 0 1 0
= 6.0
0 1 1 0 1 0
= 96
1 0 1 0 1 0
= 1536
0 0 1 0 1 1
= 7.0
0 1 1 0 1 1
= 112
1 0 1 0 1 1
= 1792
0 0 1 1 0 0
= 8.0
0 1 1 1 0 0
= 128
1 0 1 1 0 0
= 2560*
0 0 1 1 0 1
= 10
0 1 1 1 0 1
= 160
1 0 1 1 0 1
= 2560
0 0 1 1 1 0
= 12
0 1 1 1 1 0
= 192
1 0 1 1 1 0
= 3584*
0 0 1 1 1 1
= 14
0 1 1 1 1 1
= 224
1 0 1 1 1 1
= 3584
* Duplicate Encoding



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