DS1780E Maxim Integrated Products, DS1780E Datasheet - Page 16

• 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

Note: To properly implement the NAND TREE test on the PCB, no pins listed in the tree should be
connected directly to power or ground; if a pin is needed to configure as a permanent low such as an
address, it should be connected to ground through a low value resister such as 330 (to allow the ATE
(Automatic Test Equipment) to drive it high.
DS1780 NAND TREE TEST FLOW Figure 7
DS1780 REGISTERS AND RAM
INTERNAL ADDRESS REGISTER Table 10.0
ADDRESS POINTER (POWER ON DEFAULT 00h) Table 10.1
<7:0>
Temperature Configuration Register
BIT
Chassis Intrusion Clear Register
Interrupt
Interrupt
REGISTERS AND RAM
Serial Address Register
Configuration Register
INT
INT
Address Pointer
VID 4 Register
Analog Output
VID Register
Test Register
Company ID
Value RAM
INT
INT
Mask Register 1
Mask Register 2
NAME
Stepping
Status Register 1
Status Register 2
R/W
W
Address of RAM and Registers. See the tables below for detail.
<A7:A0>
20h-3Dh
(HEX)
4Bh
3Eh
3Fh
40h
41h
42h
43h
44h
46h
47h
48h
49h
15h
19h
16 of 28
POWER ON VALUE OF REGISTERS:
<7:4> = 0101, <3:0> = VID3 - VID0
DESCRIPTION
<7:1> = 1000 000, <0>=VID 4
<7:0> (BINARY)
0000 1000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0010 1101
0000 0001
0000 0000
1111 1111
1101 1010
0000 0001