AS3935-BQFT ams, AS3935-BQFT Datasheet - Page 16

• Manufacturer Part Number: AS3935-BQFT
• Description: Interface - Specialized
• Manufacturer: ams

Specifications of AS3935-BQFT

• Rohs: yes
• Operating Supply Voltage: 2.4 V to 5.5 V
• Supply Current: 100 mA
• Maximum Power Dissipation: 0.1 W
• Mounting Style: SMD/SMT
• Package / Case: MLPQ-16
• Supply Voltage - Max: 5.5 V

AS3935
Datasheet - D e t a i l e d D e s c r i p t i o n
8.4.4 Send Direct Command Byte
It is possible to send direct commands by writing 0x96 in the registers REG0x3C and REG0x3D, as shown in the table below:
Table 13. Registers 0x3C, 0x3D
8.5 I²C
An I²C slave interface is implemented for read/write access to the internal registers and to send direct commands. To enable the I²C as interface,
the Select Interface pin has to be set to the positive voltage supply (SI=VDD). The I2CL is the clock bus, while the I2CD is the data bus. An
external pull-up resistor on the I2CL pin is needed.
The device addresses for the AS3935 in read or write mode are defined by:
0-0-0-0-0-a1-a0-0: write mode device address (DW)
0-0-0-0-0-a1-a0-1: read mode device address (DR)
Where a0 and a1 are defined by the pins 5 (ADD0) and 6 (ADD1).
Figure 16. I²C Timing Diagram
Table 14. I²C Parameters
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T
T
T
Symbol
SU;STO
HD;STA
SU;STA
T
T
T
T
T
HD
SP
LO
SU
HI
PRESET_DEFAULT
Direct Command
CALIB_RCO
After high going edge of I2CL, I2CD has to stay constant for the specified setup
Within start condition, after low going I2CD, I2CL has to stay constant for
High Clock Time
Low Clock Time
Spike intensity
time before STOP or repeated start condition is applied
Parameter
specified hold time
Register
0x3C
0x3D
I2CD has to change Tsetup before rising
No hold time needed for I2CD relative to
400 kHz Clock speed
rising edge of I2CL
Revision 1.2
Conditions
edge I2CL
Calibrates automatically the internal RC Oscillators
Sets all registers in default mode
330
660
300
100
100
Min
-40
50
30
Description
Typ
100
Max
Units
ns
ns
ns
ns
ns
ns
ns
ns
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