SA56004X Datasheet, PDF (6/36 Pages) NXP Semiconductors – 1 Degrees Celcious accurate, SMBus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms

NXP Semiconductors
SA56004X
Digital temperature sensor with overtemperature alarms
Table 4. Register assignments
Register
name
Command byte
Read
Write
address address
LTHB
00h
n/a
RTHB
01h
n/a
SR
02h
n/a
CON
03h
09h
CR
04h
0Ah
LHS
05h
0Bh
LLS
06h
0Ch
RHSHB 07h
0Dh
RLSHB 08h
0Eh
One Shot n/a
0Fh
RTLB
10h
n/a
RTOHB 11h
11h
RTOLB
12h
12h
RHSLB 13h
13h
RLSLB
14h
14h
RCS
19h
19h
LCS
20h
20h
TH
21h
21h
ATLB
22h
n/a
AM
BFh
BFh
RMID
FEh
n/a
RDR
FFh
n/a
POR state
0000 0000
0000 0000
0000 0000
0000 0000
1000
0100 0110
0000 0000
0100 0110
0000 0000
-
0000 00
0000 0000
000
000
000
0101 0101
0101 0101
0 1010
0000 0000
0
1010 0001
0000 0000
Function
Bits
Access
local temperature high byte
8
R
remote temperature high byte
8
R
status register
8
R
configuration register
8
R/W
conversion rate
4
R/W
local high setpoint
8
R/W
local low setpoint
8
R/W
remote high setpoint high byte
8
R/W
remote low setpoint high byte
8
R/W
writing register initiates a one shot conversion 0
W
remote temperature low byte
6 (MSBs) R
remote temperature offset high byte
8
R/W
remote temperature offset low byte
3 (MSBs) R/W
remote high setpoint low byte
3 (MSBs) R/W
remote low setpoint low byte
3 (MSBs) R/W
remote T_CRIT setpoint
8
R/W
local T_CRIT setpoint
8
R/W
T_CRIT hysteresis
5
R/W
local temperature low byte
3 (MSBs) R
Alert mode
1
R/W
read manufacturer’s ID
8
R
read stepping or die revision
8
R
7.4 Power-on reset
When power is applied to the SA56004X, the device will enter into its Power-On Reset
(POR) state and its registers are reset to their default values. The configuration, status,
and temperature-reading registers remain in these states until after the first conversion.
As shown in Table 4 this results in:
1. Command register set to 00h.
2. Local Temperature register (LTHB and LTLB) set to 0 °C.
3. Remote Diode Temperature register (RTHB and RTLB) set to 0 °C until the end of the
first conversion.
4. Status register (SR) set to 00h.
5. Configuration register (CON) set to 00h; interrupt latches are cleared, the ALERT and
T_CRIT output drivers are off and the ALERT and T_CRIT pins are pulled HIGH by
the external pull-up resistors.
6. Local T_CRIT temperature setpoints (LCS) and Remote T_CRIT temperature
setpoints (RCS) at 85 °C.
7. Local HIGH setpoint (LHS) and remote HIGH temperature setpoint (RHSHB) at 70 °C.
SA56004X_5
Product data sheet
Rev. 05 — 22 May 2008
© NXP B.V. 2008. All rights reserved.
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