SA56004GD datasheet(6/36 Pages) NXP

6 / 36 page

SA56004X_5

Product data sheet

Rev. 05 — 22 May 2008

6 of 36

NXP Semiconductors

SA56004X

Digital temperature sensor with overtemperature alarms

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.

Table 4.

name

Command byte

POR state

Function

Bits

Access

Read

address

Write

address

LTHB

00h

n/a

0000 0000

local temperature high byte

RTHB

01h

n/a

0000 0000

remote temperature high byte

02h

n/a

0000 0000

status register

CON

03h

09h

0000 0000

conﬁguration register

R/W

04h

0Ah

1000

conversion rate

R/W

LHS

05h

0Bh

0100 0110

local high setpoint

R/W

LLS

06h

0Ch

0000 0000

local low setpoint

R/W

RHSHB

07h

0Dh

0100 0110

remote high setpoint high byte

R/W

RLSHB

08h

0Eh

0000 0000

remote low setpoint high byte

R/W

One Shot

n/a

0Fh

writing register initiates a one shot conversion

RTLB

10h

n/a

0000 00

remote temperature low byte

6 (MSBs)

RTOHB

11h

0000 0000

remote temperature offset high byte

R/W

RTOLB

12h

000

remote temperature offset low byte

3 (MSBs)

R/W

RHSLB

13h

000

remote high setpoint low byte

3 (MSBs)

R/W

RLSLB

14h

000

remote low setpoint low byte

3 (MSBs)

R/W

RCS

19h

0101 0101

remote T_CRIT setpoint

R/W

LCS

20h

0101 0101

local T_CRIT setpoint

R/W

21h

0 1010

T_CRIT hysteresis

R/W

ATLB

22h

n/a

0000 0000

local temperature low byte

3 (MSBs)

BFh

Alert mode

R/W

RMID

FEh

n/a

1010 0001

read manufacturer’s ID

RDR

FFh

n/a

0000 0000

read stepping or die revision

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