ADM1033ARQZ-REEL7 ON Semiconductor, ADM1033ARQZ-REEL7 Datasheet

Page 1

ADM1033 Thermal Monitor and Fan Speed (RPM) Controller The ADM1033 is a one channel remote− and local−temperature sensor and fan controller. The remote channel monitors the temperature of the remote thermal diode, which may be discrete 2N3904/6s or may be ...

Page 2

ADM1033 RPM FAN SPEED 1 DRIVE CONTROLLER SIGNAL TACH 2 CONDITIONING 13 LOCATION REF 8 ANALOG MULTIPLEXER D− 9 SRC BLOCK BANDCAP TEMPERATURE SENSOR CONNECT Vcc 6 SMBUS ADDRESS SERIAL BUS ...

Page 3

ABSOLUTE MAXIMUM RATINGS Parameter Positive Supply Voltage ( Voltage on Any Input or Output Pin except FAN_FAULT and LOCATION Voltage on FAN_FAULT (Note 1) Voltage on LOCATION Input Current at Any Pin Maximum Junction Temperature (T max) J ...

Page 4

ELECTRICAL CHARACTERISTICS Parameter Power Supply Supply Voltage, V (Note 2) CC Supply Current Undervoltage Lockout Threshold Power−On Reset Threshold Temperature−to−Digital Converter Internal Sensor Accuracy Resolution External Diode Sensor Accuracy Resolution Remote Sensor Source Current Series Resistance Cancellation Power ...

Page 5

ELECTRICAL CHARACTERISTICS Parameter Tachometer Accuracy Fan Speed Measurement Accuracy AGTL + INPUT (THERM) Input High Level Input Low Level SERIAL BUS TIMING (Note 4) Clock Frequency, f SCLK Glitch Immunity Bus Free Time, t BUF Start Setup Time, ...

Page 6

D+ TO GND –20 –40 –60 –80 –100 LEAKAGE RESISTANCE (MΩ) Figure 3. Temperature Error vs. PCB Track Resistance DXP to GND and V 100 ...

Page 7

MEAN – – – –7 –60 –40 – DIODE TEMPERATURE ( C) Figure 9. Remote 1 Temperature Error vs. ...

Page 8

Functional Description The ADM1033 is a local− and remote−temperature monitor and fan controller for use in a variety of applications, including microprocessor−based systems. The device accurately monitors remote and ambient temperature and uses that information to quietly control the speed ...

Page 9

Table 1. Internal Register Descriptions Register Description Configuration Provides control and configuration of various functions on the device. Conversion Rate Determines the number of measurements per second completed by the ADM1033. Address Pointer Contains the address that selects one of ...

Page 10

SMBus 2.0 Fixed and Discoverable Mode The ADM1033 also supports fixed and discoverable mode, which is backwards compatible with SMBus 1.0 and 1.1. Fixed and discoverable mode supports all the same functionality as ARP−capable mode, except for assign address in ...

Page 11

SCL SDA START BY MASTER SERIAL BUS ADDRESS BYTE Figure 18. Writing to the Address Pointer Register Only (Send Byte) 1 SCL SDA START BY MASTER SERIAL BUS ADDRESS BYTE Figure 19. Reading ...

Page 12

Block Write In this operation, the master device writes a block of data to a slave address as follows. A maximum of 32 bytes can be written. 1. The master asserts a start condition on SDA. 2. The master sends ...

Page 13

If a device’s ALERT line goes low, the following occurs: 1. SMBusALERT is pulled low. 2. The master initiates a receive byte operation and sends the alert response address (ARA 0001 100). This is a general call address that must ...

Page 14

If the sensor is used in a very noisy environment, a capacitor value up to 1000 pF may be placed between the D+ and D− inputs to filter the noise. However, additional parasitic capacitance on the lines between D+, D−, ...

Page 15

Table 8. Channel Selector Bits 5:4 Channel Selector (Configuration 2) 00 Local Channel = Default 01 Remote 1 Channel 10 Reserved 11 Reserved Removing Temperature Errors As CPUs run faster and faster, it gets more difficult to avoid high frequency ...

Page 16

The construction of a filter allows the ADM1033 and the remote temperature sensor to operate in noisy environments. Figure 29 shows a low−pass R−C−R filter with the following values 100 W and nF. This filtering ...

Page 17

Table 14. Status Register 2 (Reg. 0x50) Bit # Name Description Local THERM temperature limit has been exceeded. 6 R1T 1 = Remote 1 THERM temperature limit has been exceeded. 5 Unused Reserved ...

Page 18

HIGH LIMIT TEMPERATURE ”STICKY” STATUS BIT TEMP BACK IN LIMIT (STATUS BIT STAYS SET) SMBusALERT INTERRUPT MASK BIT SET (SMBusALERT REARMED) Figure 31. Handling SMBusALERT Interrupt Masking Register Mask Registers 1, 2, and 3 are located at Addresses 0x08, 0x09, ...

Page 19

Conversion Rate Register The ADM1033 makes measurements per second. However, for the sake of reduced power consumption and better noise immunity, users may run the ADM1033 at a slower conversion rate. Better noise immunity results from the ...

Page 20

THERM % Limit Register The THERM % limit is programmed to Register 0x19. An ALERT is generated, if THERM is asserted for longer than the programmed percentage limit. The limit is programmed as a percentage of the chosen time window. ...

Page 21

IDEAL TACH t POLE DRIVE ACTUAL TACH Figure 34. Drive Signal by Using Synchronous Control Fan Inputs Pin TACH input intended for fan speed measurement. This input is open−drain. Signal conditioning on the ADM1033 accommodates the slow ...

Page 22

V <1 kΩ R1* FAN(0–7) TACH R2 OUTPUT *SEE TEXT Figure 38. Fan with Strong TACH. Pullup to >V Totem−Pole Output, Attenuated with R1/R2 Fan Speed Measurement The fan counter does not count the fan TACH output pulses directly. ...

Page 23

Fan Response Register The ADM1033 fan speed controller operates by reading the current fan speed, comparing it with the programmed fan speed, and then updating the drive signal applied to the fan. The rate at which the ADM1033 looks at ...

Page 24

Figure 41 shows the transfer curve if the Linear Fan Speeds option is chosen. At temperature T1, the fan runs at Fan Speed 1. As the temperature increases, the fan speed increases until it reaches Fan Speed 2 at T2. ...

Page 25

Table 28. Programming the Hysteresis Code Hysteresis Value 0000 0000 0000 0001 0000 0010 0000 0101 0000 1000 0000 1111 The look−up table’s hysteresis register is at Address 0x3A. A hysteresis value of between 0°C and 15°C can be programmed ...

Page 26

Table 31. ADM1033 Registers Address R/W Description 0x00/80 R/W #Bytes/Block Read 0x01/81 R/W Configuration 1 Table/SW 0x02/82 R/W Configuration 2 0x03/83 R/W Configuration 3 0x04/84 R/W Configuration 4 FF/REF 0x05/85 R/W Conversion Rate 0x06/86 R/W Fault Queue 0x07/87 R/W Fan ...

Page 27

Table 31. ADM1033 Registers Address R/W Description 0x3C/BC R/W Fan Response 0x3D/BD R Device ID 0x3E/BE R Company ID 0x3F/BF R Revision Register 0x40/C0 R Local Temperature 0x41/C1 R Local Temperature 0x42/C2 R Remote 1 Temp 0x43/C3 R Remote 1 ...

Page 28

Table 34. Register 0x02, Configuration Register 2, Power−On Default 0x84, Lock = Y, S/W Reset = Y Bit Name R/W 7 Round Robin R/W 6 Reserved R/W <5:4> Channel Selector R/W 3 Reserved R/W 2 Discrete/Linear Speed R/W 1 Boost ...

Page 29

Table 37. Register 0x05, Configuration Rate Register, Power−On Default 0x07, Lock = Y, S/W Reset = Y Bit Name R/W 7 Reserved R <6:4> Reserved R <3:0> Conversion Rate R/W Table 38. Register 0x06, Fault Queue, Power−On Default 0x01, Lock ...

Page 30

Table 41. Register 0x09, Mask Register 2, Power−On Default 0x18, Lock = N, S/W Reset = Y Bit Name R/W <7:5> Unused R 4 THERM % R/W 3 THERM Assert R/W 2 THERM_State R/W <1:0> Unused R Table 42. Register ...

Page 31

Table 48. Register 0x10, Remote 1 THERM Limit, Power−On Default 0x95, Lock = Y, S/W Reset = N Bit Name R/W <7:0> Remote 1 THERM R/W Limit Table 49. Register 0x16, Local Offset Register, Power−On Default 0x00, Lock = Y, ...

Page 32

Table 53. Look−up Table Registers, Lock = Y, S/W Reset = Y Register Address R/W 0x22 R/W 0x23 R/W 0x24 R/W 0x25 R/W 0x26 R/W 0x27 R/W 0x28 R/W 0x29 R/W 0x2A R/W 0x2B R/W 0x2C R/W 0x2D R/W 0x2E ...

Page 33

Table 57. Register 0x3E, Company ID, Power−On Default 0x41, Lock = N, S/W Reset = N Bit Name R/W <7:0> Company ID R Table 58. Register 0x3F, Revision Register, Power−On Default 0x02, Lock = N, S/W Reset = N Bit ...

Page 34

... ADM1033ARQZ −40°C to +125°C ADM1033ARQZ−REEL −40°C to +125°C ADM1033ARQZ−RL7 −40°C to +125°C †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. *The “Z’’ suffix indicates Pb−Free part. ...

Page 35

... Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada Fax: 303− ...