DS1780E Maxim Integrated Products, DS1780E Datasheet - Page 19

• Manufacturer Part Number: DS1780E
• Description: IC CPU PERIPHERAL MON 24-TSSOP
• Manufacturer: Maxim Integrated Products

Specifications of DS1780E

• Function: Thermal Monitor, CPU Peripherals
• Topology: ADC (Sigma Delta), Comparator, Fan Speed Control, Register Bank
• Sensor Type: Internal
• Sensing Temperature: -40°C ~ 125°C
• Output Type: I²C™/SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 2.8 V ~ 5.75 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP
• Full Temp Accuracy: +/- 12 %
• Digital Output - Bus Interface: Serial (2-Wire)
• Digital Output - Number Of Bits: 8 bit
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

RESERVED REGISTER (ADDRESS 0X45; POWER-UP DEFAULT=00h)
Table 10.7
CHASSIS INTRUSION CLEAR REGISTER (ADDRESS 0X46; POWER-UP
DEFAULT=00h) Table 10.8
VID REGISTER (ADDRESS 0x47; POWER-UP DEFAULT = SEE “ADDRESS
POINTER” TABLE) Table 10.9
SERIAL ADDRESS REGISTER (ADDRESS 0x48; POWER-UP DEFAULT =
SEE DESCRIPTION BELOW) Table 10.10
VID4 REGISTER (ADDRESS 0x49; POWER-UP DEFAULT = SEE
DESCRIPTION BELOW Table 10.11
<7:0>
BIT
BIT
BIT
BIT
BIT
0-6
0-3
4-5
6-7
0-7
1-7
7
0
RESERVED
RESERVED
FAN1 RPM
FAN2 RPM
2-Wire Bus
Chassis Int
Reserved
Address
NAME
NAME
NAME
NAME
NAME
control
control
VID 4
Clear
VID
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R
Undefined (Power On = 00h).
Undefined (Power On = 00h).
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.
The VID[3:0] inputs from Pentium/PRO power supplies to indicate the operating voltage
(e.g., 1.5V to 2.9V).
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
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
2-Wire Bus Address (Power On = 001011(A1)(A0)).
VID4 Input.
Default Power On Values = 1000000.
19 of 28
DESCRIPTION
DESCRIPTION
DESCRIPTION
DESCRIPTION
DESCRIPTION