Datasheet

LM95221
SNIS134B –MAY 2004–REVISED MARCH 2013 www.ti.com
STATUS REGISTER (Read Only Address 02h)
D7 D6 D5 D4 D3 D2 D1 D0
Busy Reserved RD2M RD1M
0 0 0 0 0
Bits Name Description
7 Busy When set to "1" the part is converting.
6-2 Reserved Reports "0" when read.
1 Remote diode 2 missing (RD2M) Remote Diode 2 is missing. (i.e. D2+ shorted to V
DD
, Ground or D2-, or D2+ is
floating). Temperature Reading is FFE0h which converts to 255.875 °C if
unsigned format is selected or 8000h which converts to –128.000 °C if signed
format is selected.
0 Remote diode 1 missing (RD1M) Remote Diode 1 is missing. (i.e. D1+ shorted to V
DD
, Ground or D1-, or D1+ is
floating). Temperature Reading is FFE0h which converts to 255.875 °C if
unsigned format is selected or 8000h which converts to –128.000 °C if signed
format is selected.
CONFIGURATION REGISTER (Read Address 03h / Write Address 03h)
D7 D6 D5 D4 D3 D2 D1 D0
0 RUN/STOP CR1 CR0 0 R2DF R1DF 0
Bits Name Description
7 Reserved Reports "0" when read.
6 RUN/STOP Logic 1 disables the conversion and puts the part in standby mode.
Conversion can be activated by writing to one-shot register.
5-4 Conversion Rate (CR1:CR0) 00: continuous mode 66ms, 15 Hz (typ)
01: converts every 200ms, 5 Hz (typ)
10: converts every 1 second, 1 Hz (typ)
11: converts every 3 seconds, ⅓ Hz (typ)
Note: typically a remote diode conversion takes 26 ms and local conversion
takes 14 ms.
3 Reserved Reports "0" when read.
2 Remote 2 Data Format (R2DF) Logic 0: unsigned Temperature format (0 °C to +255.875 °C)
Logic 1: signed Temperature format (-128 °C to +127.875 °C)
1 Remote 1 Data Format (R1DF) Logic 0: unsigned Temperature format (0 °C to +255.875 °C)
Logic 1: signed Temperature format (-128 °C to +127.875 °C)
0 Reserved Reports "0" when read.
Power up default is with all bits “0” (zero)
LOCAL and REMOTE MSB and LSB TEMPERATURE REGISTERS
Table 4. Local Temperature MSB (Read Only Address 10h) 9-bit plus sign format
(1)
:
BIT D7 D6 D5 D4 D3 D2 D1 D0
Value SIGN 64 32 16 8 4 2 1
(1) Temperature Data: LSb = 1°C.
Table 5. Local Temperature LSB (Read Only Address 20h) 9-bit plus sign format
(1)
:
BIT D7 D6 D5 D4 D3 D2 D1 D0
Value 0.5 0.25 0 0 0 0 0 0
(1) Temperature Data: LSb = 0.25°C
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