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SA56004X Datasheet(PDF) 11 Page - NXP Semiconductors

Part # SA56004X
Description  1 Degrees Celcious accurate, SMBus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

SA56004X Datasheet(HTML) 11 Page - NXP Semiconductors

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Philips Semiconductors
Product data sheet
SA56004X
±1 °C accurate, SMBus-compatible, 8-pin, remote/local
digital temperature sensor with over temperature alarms
2004 Oct 06
11
Power-on-reset (POR)
When power is applied to the SA56004X, the device will enter into
its power-on-reset 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 2, 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.
8. Local LOW setpoint (LLS) and Remote LOW temperature
setpoints (RLSHB) at 0
°C.
9. Conversion Rate register (CR) is set to 8h; the default value of
about 16 conversions/s.
Starting conversion
Upon POR, the RUN/STOP bit 6 of the configuration register is zero
(default condition), then, the device will enter into its free-running
operation mode in which the device A/D converter is enabled and
the measurement function is activated. In this mode, the device
cycles the measurements of the local and remote temperature
automatically and periodically. The conversion rate is defined by the
programmable conversion rate stored in the conversion rate register.
It also performs comparison between readings and limits of the
temperature in order to set the flags and interruption accordingly at
the end of every conversion. Measured values are stored in the
temp registers, results of the limit comparisons are reflected by the
status of the flag bits in the status register and the interruption is
reflected by the logical level of the ALERT and T_CRIT output. If the
power-on temperature limit is not suitable, the temp limit values
could be written into the limit registers during the busy-conversion
duration of about 38 ms of the first conversion after power-up.
Otherwise, the status register must be read and the configuration
bit 7 must be reset in order to recover the device from interruption
caused by the undesired temp limits.
Low power software standby mode
The device can be placed in a software standby mode by setting the
RUN/STOP bit 6 in the configuration register HIGH (to 1). In
standby, the free-running oscillator is stopped, the supply current is
less than 10
µA if there is no SMBus activity, all data in the registers
is retained. However, the SMBus is still active and reading and
writing registers can still be performed. A one-shot command will
initiate a single conversion which has the same effect as any
conversion that occurs when the device is in its free-running mode.
To restore the device to free running mode, set the RUN/STOP bit 6
LOW (to 0).
Temperature data format
The temperature data can only be read from the Local and Remote
Temperature registers; the setpoint registers (e.g. T_CRIT, LOW,
HIGH) are read/write.
Both local and remote temperature reading data is represented by
an 11-bit, 2’s complement word with the LSB (Least Significant
Bit) = 0.125
°C. The temperature setpoint data for the remote
channel is also represented by an 11-bit, 2’s complement word with
the LSB = 0.125
°C. The temperature setpoint data for both the local
channel and the T_CRIT setpoints are represented by 8-bit, 2’s
complement words with the LSB = 1.0
°C. For 11-bit temp data, the
data format is a left justified, 16-bit word available in two 8-bit
registers (high byte and low byte). For 8-bit temp data, the data is
available in a single 8-bit register (high byte only).
Table 3. Temperature data format
TEMPERATURE
DIGITAL OUTPUT
BINARY
HEX
+125
°C
0111 1101 0000 0000
7D00h
+25
°C
0001 1001 0000 0000
1900h
+1
°C
0000 0001 0000 0000
0100h
+0.125
°C
0000 0000 0010 0000
0020h
0
°C
0000 0000 0000 0000
0000h
–0.125
°C
1111 1111 1110 0000
FFE0h
–1
°C
1111 1111 0000 0000
FF00h
–25
°C
1110 0111 0000 0000
E700h
–55
°C
1100 1001 0000 0000
C900h


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