參數(shù)資料
型號(hào)： TC664
廠商： Microchip Technology Inc.
英文描述： SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection
中文描述： ⑩的SMBus PWM風(fēng)扇與風(fēng)扇轉(zhuǎn)速控制器故障檢測
文件頁數(shù)： 17/36頁
文件大?。?/td> 695K
代理商： TC664
2002 Microchip Technology Inc.
DS21737A-page 17
TC664/TC665
6.0
REGISTER SET
The TC664/TC665 devices contain 7 registers that pro-
vide a variety of data and functionality control to the
outside system. These registers are listed in Table 6-1.
Of key importance is the command byte information,
which is needed in the read and write protocols to
select the individual registers.
TABLE 6-1:
COMMAND BYTE ASSIGNMENTS
6.1
RPM-OUTPUT Register (RPM)
As discussed in Section 4.7, fan current pulses are
detected at the SENSE input of the TC664/TC665
device. The current pulse information is used to calcu-
late the fan RPM. The fan RPM data is then written to
the RPM register. RPM is a 9-bit register that provides
the RPM information in 50 RPM (8-bit) or 25 RPM (9-
bit) increments. This is selected via RES (bit 6<0>) in
the Configuration Register, with ‘
0
’ = 50 RPM and
‘
1
’ = 25 RPM. The default state is zero (50 RPM). The
maximum fan RPM value that can be read is
12775 RPM. If this value is exceeded, RCO (bit 3<0>)
in the Status Register will be set to a '
1
' to indicate that
a counter overflow of the RPM Register has occurred.
Register 6-1 shows the RPM output register 9-bit for-
mat.
REGISTER 6-1:
RPM OUTPUT REGISTER (RPM)
Register
Command
Read
Write
POR Default State
Function
RPM
FAN_FAULT
CONFIG
STATUS
0000 0000
X
X
X
X
—
X
X
—
0 0000 0000
RPM Output
Fan Fault Threshold
Configuration
Status. See Section 6.4, Status
Register explanation of X
Fan Speed Duty Cycle
Manufacturer Identification
Version Identification:
(XX = ‘
10
’ TC664, XX = ‘
11
’ TC665)
0000 0010
0000 1010
0000 0100
0000 1010
0000 0101
00X0 0X00
DUTY_CYCLE
MFR_ID
VER_ID
0000 0110
X
X
X
X
—
—
0000 0010
0000 0111
0101 0100
0000 1000
0000 00XX
D(8)
D(7)
D(6)
D(5)
D(4)
D(3)
D(2)
D(1)
D(0)
RPM
0
0
0
.
.
1
1
0
0
0
.
.
1
1
0
0
0
.
.
1
1
0
0
0
.
.
1
1
0
0
0
.
.
1
1
0
0
0
.
.
1
1
0
0
0
.
.
1
1
0
0
1
.
.
1
1
0
1
0
.
.
0
1
0
25
50
12750
12775
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