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ISL21400
TABLE 1. ISL21400 REGISTER BIT MAP
D7
D0
Addr
0
1
2
3
4
(MSB)
V REF 7
TS7
D7
D7
D7
D6
V REF 6
TS6
D6
D6
D6
D5
V REF 5
TS5
D5
D5
D5
D4
V REF 4
TS4
D4
D4
D4
D3
V REF 3
TS3
D3
D3
D3
D2
V REF 2
TS2
D2
D2
D2
D1
V REF 1
TS1
GAIN1
D1
D1
(LSB)
V REF 0
TS0
GAIN0
D0
D0
( 2 ? m ) – 255
V TS --------------------------------
DACs Section
The ISL21400 contains two 8-bit DACs whose registers can
be programmed via the I 2 C serial bus. The DAC registers
are non-volatile such that the values are restored during the
V CC power-up cycle of the device. One DAC (V REF ) is
dedicated to scale the bandgap voltage reference
(Temperature invariant) and the other DAC (V TS ) is
dedicated to scale the Temperature Sensor. Both of these
DACs can determine the output voltage as defined by
Equation 1 (see “Register Descriptions”).
Output Gain Amplifier Section
The ISL21400 contains an output gain amplifier (A) that is
programmed via the I 2 C serial bus. The gain amplifier is the
last stage before the output and therefore controls the
overall gain for the device. The gain can be programmed for
Register 1: Temperature Slope Gain (Nonvolatile)
Register 1 sets the Temperature Slope (TS) of the
temperature sensor. Referring to Equation 1, the number “m”
is the setting from Register 1 as shown in Equation 3:
(EQ. 3)
255
V TS is the temperature dependent term and varies from
+136mV at -40°C to -126mV at +85°C. The other term varies
from -1 to +1 and scales the temperature term before adding
to the V REF portion.
Register 2: Device Gain and Storage (nonvolatile)
TABLE 3. REGISTER 2 OUTPUT GAIN (NONVOLATILE):
OUTPUT GAIN
1x, 2x, or 4x amplification. This gain factor is used to
program the output voltage as determined by Equation 1
(see “Register Descriptions”).
There are 5 registers in the ISL21400 device, all nonvolatile
(see Table 2). All registers are accessible for reading or
writing through the I 2 C serial bus.
GAIN1
0
0
1
1
GAIN0
0
1
0
1
OUTPUT GAIN, A V
x1
x2
x2
x4
Register Descriptions
TABLE 2. REGISTER DESCRIPTIONS
Register 2 contains 2 bits (2 LSB’s) which control the output
gain of the device. Table 3 shows the state of these two bits
REG
0
1
2
3
4
NONVOLATILE
Y
Y
Y
Y
Y
DESCRIPTION
Reference setting
Temperature Sensor setting
Gain and storage
Storage
Storage
and the resulting output gain. Note that two states produce
the same gain (Gain 1:0 set to 01b and 10b) of x2.
The other 6-bits in the register can be used for general
purpose memory (nonvolatile) or left alone.
Registers 3 and 4: General Purpose Data
(nonvolatile)
These two registers are one byte each and can be used for
Register 0: Bandgap Reference Gain (Nonvolatile)
Register 0 sets the output voltage of the bandgap reference
(V REF ). Referring to Equation 1, the number “n” is the setting
from Register 0 as shown in Equation 2:
general purpose nonvolatile memory.
I 2 C Serial Interface
The ISL21400 supports a bidirectional bus oriented protocol.
The protocol defines any device that sends data onto the
V REF ? ---------- , for n = 0 to 255
n
255
This term of Equation 1 can vary from 0V to 1.20V.
11
(EQ. 2)
bus as a transmitter and the receiving device as the receiver.
The device controlling the transfer is the master and the
device being controlled is the slave. The master always
initiates data transfers and provides the clock for both
transmit and receive operations. Therefore, the ISL21400
operates as a slave device in all applications.
FN8091.3
March 31, 2011
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