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ISL21400IU8Z bảng dữ liệu(PDF) 10 Page - Renesas Technology Corp

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Giải thích chi tiết về linh kiện  Programmable Temperature Slope Voltage Reference
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ISL21400
FN8091 Rev 3.00
Page 10 of 17
March 31, 2011
Pin Descriptions
VOUT
Programmable voltage output pin. Absolute voltage is
determined by device temperature and Equation 1. Drive
capability is limited to ±500µA output current and 5000pF
output capacitance.
A2, A1, A0
Hardware slave address pins that can be used to provide
several ISL21400 with a unique physical address to allow for
multiple devices off one I2C bus.
GND
This is the circuit ground pin. It is common for the VOUT and
control signal inputs.
SDA
Serial Data Input/Output. Bidirectional pin used for serial data
transfer. As an output, it is open drain and may be wire-ored
with any number of open drain or open collector outputs. A
pull-up resistor is required and the value is dependent on the
speed of the serial data bus and the number of outputs tied
together.
SCL
Serial Clock Input. Accepts a clock signal for clocking serial
data into and out of the device. The SCL line requires a pull-up
resistor whose value is dependent on the speed of the serial
clock bus and the number of inputs tied together.
VCC
Positive Power Supply. Connect to a voltage supply in the range
of 2.7V<VCC<5.5V, with minimum noise and ripple. For best
performance, bypass with a 0.1µF capacitor to ground. If the
AV gain is set to 4 and VOUT approaches 5.0V, then VCC must
be set to >5.2V for best output performance.
Functional Description
Functional Overview
Refer to the Functional Block Diagram on page 2. The
ISL21400 provides a programmable output voltage which
combines both a temperature independent term and a
temperature dependent term. The temperature independent
term uses a bandgap voltage reference, and the temperature
dependent term uses a Proportional To Absolute Temperature
(PTAT) reference, or Temperature Sensor. Each voltage
source is scalable using two DACs via the I2C serial bus. The
resulting output voltage can vary from 0V to over 5V and has a
variable, programmable Temperature Slope (TS).
Reference Sections
Referring to the Block Diagram on page 2, the VREF and
Temperature Sense (VTS) outputs are summed together ()
and then passed through the output gain stage (A). The
voltage output is programmable and is determined by Equation
1:
where:
•AV = 1, 2, 4
•VREF = 1.200 (not temperature dependent)
•0
 n  255 (setting contained in Register 0, VREF)
•VTS = K(T - T0)
• K = dVTS/ dT = -2.1mV/C
• T = device temperature
•T0 = +25°C
•0
 m  255 (setting contained in Register 1, TS)
See “Applications Information” on page 14 for ways to use
Equation 1 and methods for output voltage calculations.
FIGURE 13. VOUT vs IOUT (±1mA)
Typical Performance Curves (Continued)
1.200
1.201
1.202
1.203
1.204
1.205
1.206
1.207
1.208
1.209
-1
-0.5
0
0.5
1
IOUT (mA)
VREF REGISTER = 255d
TS REGISTER = 127d
AT +25°C
VOUT
AV
VREF
n
255
----------
VTS
2m
 255
255
--------------------------------
+



=
(EQ. 1)


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