ISL21400USB-EVALZ Intersil, ISL21400USB-EVALZ Datasheet - Page 10

• Manufacturer Part Number: ISL21400USB-EVALZ
• Description: EVAL BOARD FOR ISL21400
• Manufacturer: Intersil

Specifications of ISL21400USB-EVALZ

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Typical Performance Curves
Pin Descriptions
V
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 I
GND
This is the circuit ground pin. It is common for the V
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.
V
Positive Power Supply. Connect to a voltage supply in the
range of 2.7V < V
best performance, bypass with a 0.1µF capacitor to ground.
If the A
V
CC
OUT
CC
must be set to >5.2V for best output performance.
V
gain is set to 4 and V
CC
< 5.5V, with minimum noise and ripple. For
2
C bus.
10
OUT
approaches 5.0V, then
1.209
1.208
1.207
1.206
1.205
1.204
1.203
1.202
1.201
1.200
-1
(Continued)
V
TS REGISTER = 127d
AT +25°C
REF
FIGURE 13. V
REGISTER = 255d
OUT
-0.5
and
ISL21400
OUT
I
OUT
vs I
0
(mA)
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 I
0V to over 5V and has a variable, programmable
Temperature Slope (TS).
Reference Sections
Referring to the Block Diagram on page 2, the V
Temperature Sense (V
and then passed through the output gain stage (A). The
voltage output is programmable and is determined by
Equation 1:
where:
• A
• V
• 0 ≤ n ≤ 255 (setting contained in Register 0, V
• V
• K = dV
• T = device temperature
• T
• 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.
V
OUT
OUT
V
REF
TS
0
2
(±1mA)
= +25°C
C serial bus. The resulting output voltage can vary from
= 1, 2, 4
=
= K(T - T
= 1.200 (not temperature dependent)
A
TS
V
0.5
/ dT = -2.1mV/C
•
⎧
⎨
⎩
V
REF
0
)
•
--------- -
255
TS
n
) outputs are summed together (Σ)
+
1
V
TS
(
------------------------------- -
2 m
•
255
) 255
–
⎫
⎬
⎭
REF
REF
March 31, 2011
)
and
FN8091.3
(EQ. 1)