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PDF AS8525 Data sheet ( Hoja de datos )
| Número de pieza | AS8525 | |
| Descripción | LIN Transceiver | |
| Fabricantes | ams | |
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AS8525
LIN Transceiver with Voltage Regulators, Programmable Gain High
Side Amplifier, and Voltage Attenuator
1 General Description
The AS8525 is a companion IC for automotive battery sensor
systems for both low-side and high-side current sensing
applications.
The device provides two regulated 3.3V supplies from the battery
supply, attenuated battery voltage in differential form, and amplified
version of a high-side current-sense element’s voltage with a
translated common-mode voltage. The device also communicates
the system output to a LIN bus.
AS8525 is designed in a high-voltage 0.35µm CMOS process and
packaged on QFN-32.
2 Key Features
Operating voltage 4.3V to 18V, max. 42V for 500 ms
Two linear low-drop voltage regulators: VCC = 3.3V with 50mA
drive capability
Typical 50µA quiescent current in standby mode
Typical 35µA quiescent current in sleep mode
Precision voltage attenuator with power down facility
- 0.05% ratio drift accuracy and disable
Precision fully-differential programmable gain amplifier (PGA)
- High-voltage to low-voltage common-mode translation
- Gain steps 5, 25, 50, 100
LIN bus transceiver
- Load independent slew control conforming to LIN 2.1
- Short circuit protection
- TX time out fail safe feature
- Over temperature warning and shut down
Power-On Reset with OTP adjustable reset timeout and brown-
out detection
Over temperature warning & shutdown functions
Operating modes: Normal, Standby, Sleep, Temporary shut
down
Microcontroller 4-wire interface
RC oscillator and programmable timer
Optional window watchdog in normal mode and time-out
watchdog in standby mode
8 backup registers to store MCU data during VCC shut down
Load dump protection for all battery supplied pins, LIN bus pin
and Enable pin
Internal reverse polarity protection (up to -27V) for all battery-
sensing pins and LIN bus pin
Chip ID for traceability
-40ºC to +115ºC ambient operating temperature
32-pin QFN (5x5) package
3 Applications
The AS8525 is suitable for LIN networked 14V battery sensor slaves
for current measurement in positive battery power rail (high side) or
in minus rail (PGA is left un-used in that case).
The device is also ideal for general purpose system basis chip for
actuator LIN slaves with battery voltage sensing and actuator high
side current sensing.
www.ams.com/AS8525
Revision 2.4
1 - 38
1 page  
AS8525
Datasheet - Pin Assignments
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
32 31 30 29 28 27 26 25
1 24 VCC
VBAT 2
23 AVCC
HRSHH 3
22 TX
VSUP2 4
HRSHL 5
AS8525
(QFN-32)
21 RX
20 CS
6 19 SDO
VBAT_DIV 7
18 SCLK
VBAT_DIVN 8
9
17 SDI
10 11 12 13 14 15 16
4.1 Pin Descriptions
Table 1. Pin Descriptions
Pin Name
NC
VBAT
HRSHH
VSUP2
HRSHL
NC
VBAT_DIV
VBAT_DIVN
LRSHL
LRSHH
Pin Number
1
2
3
4
5
6
7
8
9
10
www.ams.com/AS8525
Pin Type
Analog Input
Supply
Analog Input
Analog Output
Description
Not connected
Battery voltage input
Battery-side connection to high-side current-sense element
Supply input for the high-side amplifier
Load-side connection to high-side current-sense element
Not connected
Attenuated battery voltage output (differential)
Gained current-sense element voltage output with translated
common-mode voltage (differential)
Revision 2.4
5 - 38
5 Page 
AS8525
Datasheet - Electrical Characteristics
6.2.2 VCMREF Generator
Table 7. VCMREF Generator
Symbol
Parameter
VCMREF_AMP Common-mode reference voltage
6.2.3 Voltage Attenuator
Table 8. Voltage Attenuator
Symbol
Parameter
RDIV Division ratio
VBAT
εp,RDIV
εdt1,RDIV
εdt2,RDIV
Input voltage range/
Battery voltage range
Ratio error
Ratio drift
(w.r.t Temperature)
6.2.4 Voltage Regulators (LDO & ALDO)
Table 9. Voltage Regulators (LDO & ALDO)
Symbol
Parameter
VSUP
Input Supply Voltage
VCC
AVCC
Output Voltage Range
ILOAD
LDO Load Current
ALDO Load Current
ICC_SH
Output Short Circuit Current
dVCC1
Line Regulation
LOREG
Load Regulation
CL1
ESR1
CL2
ESR2
CL1
ESR1
CL2
ESR2
Output Capacitor1 LDO
Output Capacitor2 LDO
Output Capacitor1 ALDO
Output Capacitor2 ALDO
Conditions
When AVCC=3.3V
Conditions
Factory option
At room temperature, VBAT=12V
Temperature: -25 to +65ºC
@VBAT = 12V
Temperature: -40 to +115ºC
@VBAT = 12V
Conditions
Normal mode
ΔVCC / ΔVSUP for VSUP range
ΔVCC / ΔICCn
(0.5mA < ILOAD < 50mA)
Electrolytic
Ceramic
Electrolytic
Ceramic
Min Typ Max Units
1.55 1.65 1.75
V
Min Typ Max Units
481
V/V
21
4.5 12 18
V
±1 %
±0.05 0.1
0.1 0.2
%
Min Typ Max Units
4.3 12 18
V
3.15 3.3 3.45
V
50 mA
0.01 50 mA
250 mA
8 mV/V
1 mV/mA
2.2 10 µF
1 10 Ω
100 220 nF
0.02 1 Ω
2.2 5 µF
1 10 Ω
100 220 nF
0.02 1 Ω
www.ams.com/AS8525
Revision 2.4
11 - 38
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS8525.PDF ] | |
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