AS7000 datasheet(84/92 Pages) AMSCO

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Page 84

ams Datasheet

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[v1-12] 2018-Feb-26

AS7000 − Application Information

Figure 116:

Measurement System With Motion Artefact Compensation Using AS7000 Dedicated Accelerometer

Note(s):

1. Accelerometer connected directly

In above configuration, the AS7000 I²C master is used to poll

the data from the accelerometer.

The AS7000 has internal protection diodes on all GPIO pins

connected to VDD. If VDD is switched off, all GPIO pins are

clamped to this VDD supply plus one diode voltage (typically

0.6V). Therefore connect the periphery supply of these pins

(example: I²C pins from host in above example connected to

GPIO2/3), which are connected to the AS7000 GPIO pins to the

same VDD supply as the AS7000. If this is not possible, ensure

that these pins are at logic 0 if the VDD supply of AS7000 is

switched off.

AS7000

M0 CPU

+ RAM/

EEPROM

& Interfaces

GPIO4

GPIO3

GPIO2

GPIO1

GPIO0

GPIO8

GPIO7

GPIO6

GPIO5

LDO

Ref

Optical barrier

AGND

SIGREF

VDD

V_LDO

GND

2.6V-3.6V

VD1

VD2

VD4

VD3

LED

Supply

(DCDC)

SCL

SDA

Accelerometer

Host

Processor

LCD

VDD LDO

ON=0

I2C to AS7000

VDD

PMIC

+Charger

to LED Supply

Bluetooth

VBAT

GPIO2

GPIO3

VDD

GND

VD3/VD4: if not

used connect to

GND

AS7000 데이터시트(PDF) 84 Page - ams AG

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