Rainbow Electronics DS600 - Manual (Page 3)

DS600 ±0.5°C Accurate Analog-Output Temperature Sensor
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PIN DESCRIPTION
PIN NAME FUNCTION
1 V
DD
Supply Voltage. 2.7V to 5.5V
2 TO
Active-High Thermostat Output. Open-drain output transitions from low to high when the output
voltage exceeds V
TH
. In shutdown mode, (SD = 1), TO is low.
3 TO
Active-Low Thermostat Output. Open-drain output transitions from high to low when the output
voltage exceeds V
TH
. In shutdown mode, (SD = 1), TO is high.
4 V
OUT
Temperature Output. Outputs a voltage that is proportional to the die temperature in degrees
centigrade. In shutdown mode, this pin goes high-Z.
5 V
TH
Thermostat Trip Voltage. User-selectable voltage that sets the thermostat trip-point temperature.
TO and TO are asserted when V
OUT
crosses this voltage. (No on-chip hysteresis is present).
6 SD
Shutdown. Power consumption and thermal sensor function are controlled through SD. This pin
functions as an active-high input pin. Driving this pin high puts the device in a low-power state and
discontinues thermal sensing.
7 CTG Must be connected to GND.
8 GND Ground.
Figure 1. Block Diagram
TEMPERATURE MEASUREMENT
The DS600 analog temperature sensor measures it own temperature and provides these measurements to the
user in the form of an output voltage, V
OUT
, that is proportional to degrees centigrade. The output voltage
characteristic is factory-calibrated for a typical output gain ( ∆ V/ ∆ T) of +6.45mV/°C and a DC offset (V
OS
) of 509mV.
Its operating temperature range is -40°C to +125°C, corresponding to an output voltage range of 251mV to
1315mV. (V
OUT
= Device Temperature (°C) x ∆ V/ ∆ T + V
OS
). The DS600 has ±0.5°C accuracy over a -20°C to
+100°C temperature range and over the full 2.7V to 5.5V voltage range. Because the output voltage is positive for
the entire temperature range, there is no need for a negative supply.
Figure 2 shows the output voltage characteristic for the DS600.
TEMPERATURE
SENSOR
V
OUT
V
TH
TO
TO
SD
V
DD
GND
CONTROL
LOGIC
LEVEL-SHIFT
BUFFER
THERMOSTAT
COMPARATOR
2.7V to 5.5V
DS600