Datasheet
Table Of Contents
- FEATURES
- Applications
- Key Specifications
- DESCRIPTION
- Absolute Maximum Ratings
- Operating Ratings
- Temperature-to-Digital Converter Characteristics
- Logic Electrical Characteristics
- SMBus DIGITAL SWITCHING CHARACTERISTICS
- Functional Description
- CONVERSION SEQUENCE
- THE ALERT OUTPUT
- T_CRIT_A OUTPUT and T_CRIT LIMIT
- POWER ON RESET DEFAULT STATES
- SMBus INTERFACE
- TEMPERATURE DATA FORMAT
- OPEN-DRAIN OUTPUTS
- DIODE FAULT DETECTION
- COMMUNICATING with the LM90
- SERIAL INTERFACE RESET
- DIGITAL FILTER
- Fault Queue
- One-Shot Register
- LM90 REGISTERS
- COMMAND REGISTER
- LOCAL and REMOTE TEMPERATURE REGISTERS (LT, RTHB, RTLB)
- STATUS REGISTER (SR)
- CONFIGURATION REGISTER
- CONVERSION RATE REGISTER
- LOCAL and REMOTE HIGH SETPOINT REGISTERS (LHS, RHSHB, and RHSLB)
- LOCAL and REMOTE LOW SETPOINT REGISTERS (LLS, RLSHB, and RLSLB)
- REMOTE TEMPERATURE OFFSET REGISTERS (RTOHB and RTOLB)
- LOCAL and REMOTE T_CRIT REGISTERS (RCS and LCS)
- T_CRIT HYSTERESIS REGISTER (TH)
- FILTER and ALERT CONFIGURE REGISTER
- MANUFACTURERS ID REGISTER
- DIE REVISION CODE REGISTER
- Application Hints
- Revision History
LM90
www.ti.com
SNIS126A –MAY 2004–REVISED MARCH 2013
For LHS and RHSHB: HIGH setpoint temperature data. Power up default is LHIGH = RHIGH = 70°C. 1LSB =
1°C. Two's complement format.
Table 7. LOCAL and REMOTE HIGH SETPOINT REGISTERS (RHSLB) (Read/Write Address 13h):
BIT D7 D6 D5 D4 D3 D2 D1 D0
Value 0.5 0.25 0.125 0 0 0 0 0
For RHSLB: Remote HIGH Setpoint Low Byte temperature data. Power up default is 0°C. 1LSB = 0.125°C.
Two's complement format.
LOCAL and REMOTE LOW SETPOINT REGISTERS (LLS, RLSHB, and RLSLB)
Table 8. LOCAL and REMOTE LOW SETPOINT REGISTERS (LLS, RLSHB) (Read Address 06h, 08h, /Write
Address 0Ch, 0Eh):
BIT D7 D6 D5 D4 D3 D2 D1 D0
Value SIGN 64 32 16 8 4 2 1
For LLS and RLSHB: HIGH setpoint temperature data. Power up default is LHIGH = RHIGH = 0°C. 1LSB = 1°C.
Two's complement format.
Table 9. LOCAL and REMOTE LOW SETPOINT REGISTERS (RLSLB) (Read/Write Address 14h):
BIT D7 D6 D5 D4 D3 D2 D1 D0
Value 0.5 0.25 0.125 0 0 0 0 0
For RLSLB: Remote HIGH Setpoint Low Byte temperature data. Power up default is 0°C. 1LSB = 0.125°C. Two's
complement format.
REMOTE TEMPERATURE OFFSET REGISTERS (RTOHB and RTOLB)
Table 10. REMOTE TEMPERATURE OFFSET REGISTERS (RTOHB) (Read/Write Address 11h):
BIT D7 D6 D5 D4 D3 D2 D1 D0
Value SIGN 64 32 16 8 4 2 1
For RTOHB: Remote Temperature Offset High Byte. Power up default is LHIGH = RHIGH = 0°C. 1LSB = 1°C.
Two's complement format.
Table 11. REMOTE TEMPERATURE OFFSET REGISTERS (RTOLB) (Read/Write Address 12h):
BIT D7 D6 D5 D4 D3 D2 D1 D0
Value 0.5 0.25 0.125 0 0 0 0 0
For RTOLB: Remote Temperature Offset High Byte. Power up default is 0°C. 1LSB = 0.125°C. Two's
complement format.
The offset value written to these registers will automatically be added to or subtracted from the remote
temperature measurement that will be reported in the Remote Temperature registers.
LOCAL and REMOTE T_CRIT REGISTERS (RCS and LCS)
Table 12. LOCAL and REMOTE T_CRIT REGISTERS (RCS and LCS) (Read/Write Address 20h, 19h):
BIT D7 D6 D5 D4 D3 D2 D1 D0
Value SIGN 64 32 16 8 4 2 1
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