Related Parts .............................................. 82
2978afb
For more information
www.linear.com/LTC2978A
3
LTC2978A
ABSOLUTE MAXIMUM RATINGS
Supply Voltages:
V
PWR
to GND ......................................... –0.3V to 15V
V
DD33
to GND ....................................... –0.3V to 3.6V
V
DD25
to GND ..................................... –0.3V to 2.75V
Digital Input/Output Voltages:
ALERTB, SDA, SCL, CONTROL0,
CONTROL1............................................ –0.3V to 5.5V
PWRGD, SHARE_CLK,
WDI/RESETB, WP ....................–0.3V to V
DD33
+ 0.3V
FAULTB00, FAULTB01, FAULTB10,
FAULTB11 ................................–0.3V to V
DD33
+ 0.3V
ASEL0, ASEL1 ..........................–0.3V to V
DD33
+ 0.3V
Analog Voltages:
REFP ................................................... –0.3V to 1.35V
REFM to GND........................................ –0.3V to 0.3V
V
IN_SNS
to GND...................................... –0.3V to 15V
V
SENSEP[7:0]
to GND ................................. –0.3V to 6V
V
SENSEM[7:0]
to GND ................................ –0.3V to 6V
V
OUT_EN[3:0]
, V
IN_EN
to GND .................. –0.3V to 15V
V
OUT_EN[7:4]
to GND ................................. –0.3V to 6V
V
DACP[7:0]
to GND .................................... –0.3V to 6V
V
DACM[7:0]
to GND ................................ –0.3V to 0.3V
Operating Junction Temperature Range:
LTC2978AC .............................................. 0°C to 70°C
LTC2978AI ...........................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 125°C
Maximum Junction Temperature ........................ 125°C*
*See OPERATION section for detailed EEPROM de-
rating information for junction temperatures in excess
of 85°C.
(Notes 1, 2)
PIN CONFIGURATION
64 V
SENSEP6
63 V
SENSEM5
62 V
SENSEP5
61 V
DACM7
60 V
DACP7
59 V
DACP6
58 V
DACM6
57 V
DACM5
56 V
DACP5
55 V
DACP4
54 V
DACM4
53 V
SENSEM4
52 V
SENSEP4
51 V
DACM3
50 V
DACP3
49 V
SENSEM3
V
SENSEM6
1
V
SENSEP7
2
V
SENSEM7
3
V
OUT_EN0
4
V
OUT_EN1
5
V
OUT_EN2
6
V
OUT_EN3
7
V
OUT_EN4
8
V
OUT_EN5
9
V
OUT_EN6
10
V
OUT_EN7
11
V
IN_EN
12
DNC 13
V
IN_SNS
14
V
PWR
15
V
DD33
16
65
GND
48 V
SENSEP3
47 V
SENSEM2
46 V
SENSEP2
45 V
DACM2
44 V
DACP2
43 V
SENSEM1
42 V
SENSEP1
41 V
DACM1
40 V
DACP1
39 V
DACP0
38 V
DACM0
37 V
SENSEM0
36 V
SENSEP0
35 REFM
34 REFP
33 ASEL1
UP PACKAGE
64-LEAD (9mm
×
9mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA-TOP
= 28°C/W,
θ
JC-BOTTOM
= 1°C/W
EXPOSED PAD (PIN 65) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
ORDER INFORMATION
LEAD FREE FINISH
LTC2978ACUP#PBF
LTC2978AIUP#PBF
TAPE AND REEL
LTC2978ACUP#TRPBF
LTC2978AIUP#TRPBF
http://www.linear.com/product/LTC2978A#orderinfo
PART MARKING*
LTC2978AUP
LTC2978AUP
PACKAGE DESCRIPTION
64-Lead (9mm
×
9mm) Plastic QFN
64-Lead (9mm
×
9mm) Plastic QFN
JUNCTION TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
Consult ADI Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
V
DD33
17
V
DD25
18
WP 19
PWRGD 20
SHARE_CLK 21
WDI/RESETB 22
FAULTB00 23
FAULTB01 24
FAULTB10 25
FAULTB11 26
SDA 27
SCL 28
ALERTB 29
CONTROL0 30
CONTROL1 31
ASEL0 32
4
2978afb
For more information
www.linear.com/LTC2978A
LTC2978A
ELECTRICAL CHARACTERISTICS
SYMBOL
V
PWR
I
PWR
I
VDD33
V
UVLO_VDD33
PARAMETER
V
PWR
Supply Input Operating Range
V
PWR
Supply Current
V
DD33
Supply Current
V
DD33
Undervoltage Lockout
V
DD33
Undervoltage Lockout
Hysteresis
V
DD33
Supply Input Operating Range
Regulator Output Voltage
V
DD25
t
INIT
Regulator Output Voltage
Initialization Time
V
PWR
= V
DD33
4.5V ≤ V
PWR
≤ 15V
3.13V ≤ V
DD33
≤ 3.47V
Time from V
IN
Applied Until the
TON_DELAY Timer Starts
V
REF
= V
REFP
– V
REFM
, 0 < I
REFP
< 100µA
(Note 3)
Differential Voltage:
V
IN_ADC
= (V
SENSEPn
– V
SENSEMn
)
Single-Ended Voltage: V
SENSEMn
Current Sense Input Range (Odd
Numbered Channels Only)
N_ADC
Voltage Sense Resolution (Uses L16
Format)
Current Sense Resolution (Odd
Numbered Channels Only)
Single-Ended Voltage: V
SENSEPn
, V
SENSEMn
Differential Voltage: V
IN_ADC
0V ≤ V
IN_ADC
≤ 6V
0mV ≤ |V
IN_ADC
| < 16mV (Note11)
16mV ≤ |V
IN_ADC
| < 32mV
32mV ≤ |V
IN_ADC
| < 63.9mV
63.9mV ≤ |V
IN_ADC
| < 127.9mV
127.9mV ≤ |V
IN_ADC
|
Voltage Sense Mode V
IN_ADC
≥ 1V
Voltage Sense Mode 0 ≤ V
IN_ADC
≥ 1V
TUE_ADC_
CURR_SNS
Total Unadjusted Error
Current Sense Mode, Odd Numbered
Channels Only, 20mV ≤ V
IN_ADC
≤ 170mV
Current Sense Mode, Odd Numbered
Channels Only, V
IN_ADC
≤ 20mV
V
OS_ADC
t
CONV_ADC
Offset Error
Conversion Time
Current Sense Mode, Odd Numbered
Channels Only
Voltage Sense Mode (Note 4)
Current Sense Mode (Note 4)
Temperature Input (Note 4)
t
UPDATE_ADC
Maximum Update Time
Odd Numbered Channels in Current Sense
Mode (Note 4)
l
l
l
l
l
l
l
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
1. Introduction
Electronic scales are gradually replacing traditional measuring tools like springs and balances in everyday life, such as electronic price computing scales and electronic weigh...[详细]
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