BH1900NUX Datasheet, PDF (9/22 Pages) Rohm – Digital Temperature Sensor IC

BH1900NUX
Register Map^{(Note 1)}
Register
Address
Register Name
R/W
Byte
0x00
Temperature
Register
1
R
2
0x01
Configuration
Register
1
RW
2
D7
D6
D5
D4
D3
D2
Temperature Data[11:4]
Temperature Data[3:0]
0
OS ALERT 0
FAULT
QUEUE[1:0]
0
0
0
0
0
0
POL
0
D1
D0
0
0
0
SD
WT[1:0]
1
0x02 TLOW Register RW
2
TLOW Limit[11:4]
TLOW Limit[3:0]
0
0
0
1
0x03 THIGH Register RW
2
THIGH Limit[11:4]
THIGH Limit[3:0]
0
0
0
0x04 Software Reset RW 1
0
0
0
0
0
0
0
(Note 1) Do not write any commands to other addresses except above. Do not write ‘1’ to the fields in which value is ‘0’ in above table.
0
0
SW_
RST
( 0x00 ) Temperature Register
Fields
Temperature Data[11:0]
Function
Measurement Temperature Data Output Register.
Negative numbers are represented in binary twos complement format. The
Temperature Register is 0x0000 until the first conversion complete after a software
reset or power-on.
Conversion to temperature value is like below.
Measurement Temperature Value [°C] = Temperature Data [11:0] x 0.0625
default value 0x0000
( 0x01 ) Configuration Register
Fields
OS
Function
When the device is in shutdown mode, writing ‘1’ to the OS bit starts a single
temperature measurement. The device returns to the shutdown state at the
completion of the single measurement.
0 : Continuous Measurement
1 : Single Measurement
When reading ‘0’ is read.
ALERT
The ALERT bit is a read-only register, it provides information of interrupt state. The
ALERT bit becomes ‘0’, when Temperature Data or ALERT is read.
0 : Interrupt is not active
1 : Interrupt is active
FAULT QUEUE[1:0]
The FAULT QUEUE is number of consecutive times. When consecutive
measurement values are out of range, the ALERT pin state changes.
00 : Single
01 : 2times
10 : 4times
11 : 6times
POL
SD
The POL bit selects the polarity of the ALERT pin output.
0 : Active Low
1 : Active High
When ‘1’ is written in SD field, it becomes shut down mode after the measurement
temperature.
0 : Active
1 : Shut Down
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 15 • 001
9/18
TSZ02201-0M2M0F516010-1-2
26.Apr.2016 Rev.001