LM95214EB/NOPB National Semiconductor, LM95214EB/NOPB Datasheet - Page 10

• Manufacturer Part Number: LM95214EB/NOPB
• Description: BOARD EVALUATION FOR LM95214
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM95214EB/NOPB

• Sensor Type: Temperature
• Sensing Range: -40°C ~ 140°C
• Interface: SMBus (2-Wire/I²C)
• Sensitivity: ±1°C
• Voltage - Supply: 3 V ~ 3.6 V
• Embedded: No
• Utilized Ic / Part: LM95214
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM95214EB

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grammable conversion rate register as well as a shutdown
mode for power savings. One round of conversions can be
triggered in shutdown mode by writing to the one-shot register
through the SMBus interface. LM95214 can be programmed
to turn off unused channels for more power savings.
The LM95214 register set has an 8-bit data structure and in-
cludes:
1.
2.
3.
4.
5.
6.
7.
8.
9.
1.1 CONVERSION SEQUENCE
The LM95214 takes approximately 190 ms to convert the Lo-
cal Temperature, Remote Temperatures 1 through 4, and to
update all of its registers. These conversions for each thermal
diode are addressed in a round robin sequence. Only during
Temperature Value Registers with signed format
— Most-Significant-Byte (MSB) and Least-Significant-
— MSB and LSB Remote Temperature 1
— MSB and LSB Remote Temperature 2
— MSB and LSB Remote Temperature 3
— MSB and LSB Remote Temperature 4
Temperature Value Registers with unsigned format
— MSB and LSB Remote Temperature 1
— MSB and LSB Remote Temperature 2
— MSB and LSB Remote Temperature 3
— MSB and LSB Remote Temperature 4
Diode Configuration Registers
— Diode Model Select
— Remote 1 Offset
— Remote 2 Offset
— Remote 3 Offset
— Remote 4 Offset
General Configuration Registers
— Configuration (Standby, Fault Queue enable for
— Channel Conversion Enable
— Filter Setting for Remote 1 and 2
— 1-Shot
Status Registers
— Main Status Register (Busy bit, Not Ready, Status
— Status 1 (diode fault)
— Status 2 (TCRIT1)
— Status 3 (TCRIT2)
— Status 4 (TCRIT3)
Mask Registers
— TCRIT1 Mask
— TCRIT2 Mask
— TCRIT3 Mask
Limit Registers
— Local Tcrit Limit
— Remote 1 Tcrit-1 Limit
— Remote 2 Tcrit-1 Limit
— Remote 3 Tcrit Limit
— Remote 4 Tcrit Limit
— Remote 1 Tcrit-2 and Tcrit-3 Limit
— Remote 2 Tcrit-2 and Tcrit-3 Limit
— Common Tcrit Hysteresis
Manufacturer ID Register
Revision ID Register
Byte (LSB) Local Temperature
Remote 3 and 4; Conversion Rate)
Register 1 to 4 Flags)
10
the conversion process the busy bit (D7) in Status register
(02h) is high. The conversion rate may be modified by the
Conversion Rate bits found in the Configuration Register
(03h). When the conversion rate is modified a delay is insert-
ed between each round of conversions, the actual time for
each round remains at 190 ms (typical all channels enabled).
The time a round takes depends on the number of channels
that are on. Different conversion rates will cause the LM95214
to draw different amounts of average supply current as shown
in Figure 1. This curve assumes all the channels are on. If
channels are turned off the average current will drop since the
round robin time will decrease and the shutdown time will in-
crease during each conversion interval.
1.2 POWER-ON-DEFAULT STATES
LM95214 always powers up to these known default states.
The LM95214 remains in these states until after the first con-
version.
1.
2.
3.
4.
5.
6.
7.
8.
TCRIT1 Masked,
TCRIT2
TCRIT3
Output
FIGURE 1. Conversion Rate Effect on Power Supply
Pin
All Temperature readings set to 0°C until the end of the
first conversion
Remote offset for all channels 0°C
Configuration: Active converting, Fault Queue enabled
for Remote 3 and 4
Continuous conversion with all channels enabled,
time = 1s
Enhanced digital filter enabled for Remote 1 and 2
Status Registers depends on state of thermal diode
inputs
Local and Remote Temperature Limits for TCRIT1,
TCRIT2 and TCRIT3 outputs:
Manufacturers ID set to 01h
Remote
(°C)
85
85
85
4
Temperature Channel Limit
Masked,
Remote
(°C)
85
85
85
3
Current
Masked,
Remote
(°C)
110
85
85
2
Masked,
Remote
(°C)
110
85
85
1
30006106
Masked,
Masked,
Local
(°C)
85
85
85