Datasheet

TPS2480
TPS2481
www.ti.com SLUS939B –APRIL 2010–REVISED DECEMBER 2010
Data Output Registers
Shunt Voltage Register 01h (Read-Only)
The Shunt Voltage Register stores the current shunt voltage reading, V
SHUNT
. Shunt Voltage Register bits are
shifted according to the PGA setting selected in the Configuration Register (00h). When multiple sign bits are
present, they will all be the same value. Negative numbers are represented in two's complement format.
Generate the two's complement of a negative number by complementing the absolute value binary number and
adding 1. Extend the sign, denoting a negative number by setting the MSB = '1'. Extend the sign to any
additional sign bits to form the 16-bit word.
Example: For a value of V
SHUNT
= –320 mV:
1. Take the absolute value (include accuracy to 0.01mV)==> 320.00
2. Translate this number to a whole decimal number ==> 32000
3. Convert it to binary==> 111 1101 0000 0000
4. Complement the binary result : 000 0010 1111 1111
5. Add 1 to the Complement to create the Two’s Complement formatted result ==> 000 0011 0000 0000
6. Extend the sign and create the 16-bit word: 1000 0011 0000 0000 = 8300h (Remember to extend the sign to
all sign-bits, as necessary based on the PGA setting.)
At PGA = ÷8, full-scale range = ±320 mV (decimal = 32000, positive value hex = 7D00, negative value hex =
8300), and LSB = 10 mV.
BIT # D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
BIT
SIGN SD14_8 SD13_8 SD12_8 SD11_8 SD10_8 SD9_8 SD8_8 SD7_8 SD6_8 SD5_8 SD4_8 SD3_8 SD2_8 SD1_8 SD0_8
NAME
POR
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
VALUE
At PGA = ÷4, full-scale range = ±160 mV (decimal = 16000, positive value hex = 3E80, negative value hex =
C180), and LSB = 10 mV.
BIT # D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
BIT
SIGN SIGN SD13_4 SD12_4 SD11_4 SD10_4 SD9_4 SD8_4 SD7_4 SD6_4 SD5_4 SD4_4 SD3_4 SD2_4 SD1_4 SD0_4
NAME
POR
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
VALUE
At PGA = ÷2, full-scale range = ±80 mV (decimal = 8000, positive value hex = 1F40, negative value hex =
E0C0), and LSB = 10 mV.
BIT # D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
BIT
SIGN SIGN SIGN SD12_2 SD11_2 SD10_2 SD9_2 SD8_2 SD7_2 SD6_2 SD5_2 SD4_2 SD3_2 SD2_2 SD1_2 SD0_2
NAME
POR
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
VALUE
At PGA = ÷1, full-scale range = ±40 mV (decimal = 4000, positive value hex = 0FA0, negative value hex = F060),
and LSB = 10 mV.
BIT # D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
BIT
SIGN SIGN SIGN SIGN SD11_1 SD10_1 SD9_1 SD8_1 SD7_1 SD6_1 SD5_1 SD4_1 SD3_1 SD2_1 SD1_1 SD0_1
NAME
POR
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
VALUE
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