Rainbow Electronics LM95221 - Manual (Page 12)

2.0 LM95221 Registers
(Continued)
2.1 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.
2.2 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, 1 ⁄
3
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)
LM95221
www.national.com 12