ADT7476ARQZ データシートの表示（PDF） - Analog Devices
部品番号
コンポーネント説明
メーカー
ADT7476ARQZ Datasheet PDF : 72 Pages
| |||
ADT7476
Table 34. PWM Configuration Registers
Register Address
R/W1
0x5C
R/W
0x5D
R/W
0x5E
R/W
Description
PWM1 configuration
PWM2 configuration
PWM3 configuration
Power-On Default
0x62
0x62
0x62
1 These registers become read-only when the Configuration Register 1 lock bit is set to 1. Any subsequent attempts to write to these registers fail.
Table 35. Register 0x5C, Register 0x5D, and Register 0x5E—PWM Configuration Registers (Power-On Default = 0x62)
Bit
Name
R/W
Description
[2:0]
SPIN
R/W
These bits control the startup timeout for PWMx. The PWM output stays high until two valid
TACH rising edges are seen from the fan. If there is not a valid TACH signal during the fan TACH
measurement directly after the fan startup timeout period, then the TACH measurement reads
0xFFFF and Interrupt Status Register 2 reflects the fan fault. If the TACH minimum high and
low bytes contain 0xFFFF or 0x0000, then the Status Register 2 bit is not set, even if the fan has
not started.
000 = No startup timeout
001 = 100 ms
010 = 250 ms (default)
011 = 400 ms
100 = 667 ms
101 = 1 sec
110 = 2 sec
111 = 4 sec
[4]
INV
R/W
This bit inverts the PWM output. The default is 0, which corresponds to a logic high output for
100% duty cycle. Setting this bit to 1 inverts the PWM output, so 100% duty cycle corresponds
to a logic low output.
[7:5]
BHVR
R/W
These bits assign each fan to a particular temperature sensor for localized cooling.
000 = Remote 1 temperature controls PWMx (automatic fan control mode).
001 = Local temperature controls PWMx (automatic fan control mode).
010 = Remote 2 temperature controls PWMx (automatic fan control mode).
011 = PWMx runs full speed (default).
100 = PWMx disabled.
101 = Fastest speed calculated by local and Remote 2 temperature controls PWMx.
110 = Fastest speed calculated by all three temperature channel controls PWMx.
111 = Manual mode. PWM duty cycle registers (Register 0x30 to Register 0x32) become
writable.
Rev. A | Page 61 of 72
Share Link: 