Rainbow Electronics DS1780 - Manual (Page 19)

DS1780
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RESERVED REGISTER (ADDRESS 0X45; POWER-UP DEFAULT=00h)
Table 10.7
BIT NAME R/W DESCRIPTION
<7:0> RESERVED R/W Undefined (Power On = 00h).
CHASSIS INTRUSION CLEAR REGISTER (ADDRESS 0X46; POWER-UP
DEFAULT=00h) Table 10.8
BIT NAME R/W DESCRIPTION
0-6 RESERVED R/W Undefined (Power On = 00h).
7
Chassis Int
Clear
R/W
A 1 outputs a minimum 20 ms active low pulse on the Chassis Intrusion (CHS) pin. The
register bit clears itself after the pulse has been output.
VID REGISTER (ADDRESS 0x47; POWER-UP DEFAULT = SEE “ADDRESS
POINTER” TABLE) Table 10.9
BIT NAME R/W DESCRIPTION
0-3 VID R
The VID[3:0] inputs from Pentium/PRO power supplies to indicate the operating voltage
(e.g., 1.5V to 2.9V).
4-5
FAN1 RPM
control
R/W
FAN1 Speed Control.
<5:4> = 00 - divide by 1
<5:4> = 01 - divide by 2
<5:4> = 10 - divide by 4
<5:4> = 11 - divide by 8
6-7
FAN2 RPM
control
R/W
FAN2 Speed Control.
<7:6> = 00 - divide by 1
<7:6> = 01 - divide by 2
<7:6> = 10 - divide by 4
<7:6> = 11 - divide by 8
SERIAL ADDRESS REGISTER (ADDRESS 0x48; POWER-UP DEFAULT =
SEE DESCRIPTION
BELOW) Table 10.10
BIT NAME R/W DESCRIPTION
0-7
2-Wire Bus
Address
R/W 2-Wire Bus Address (Power On = 001011(A1)(A0)).
VID4 REGISTER (ADDRESS 0x49; POWER-UP DEFAULT = SEE
DESCRIPTION BELOW Table 10.11
BIT NAME R/W DESCRIPTION
0 VID 4 R VID4 Input.
1-7 Reserved R/W Default Power On Values = 1000000.