16
FN6486.2
September 8, 2015
keeping the power blocks disabled. Once the V
CC
rises
above UVLO, the POWER OK signal given to the I
2
C
interface block will be HIGH, the I
2
C interface becomes
operative and the SRs can be configured by the main
microprocessor. About 400mV of hysteresis is provided in the
UVLO threshold to avoid false triggering of the Power-On
reset circuit. (I
2
C comes up with EN = 0; EN goes HIGH at the
same time as (or later than) all other I
2
C data for that PWM
becomes valid).
ADDRESS Pin
Connecting this pin to GND the chip I
2
C interface address is
0001000, but, it is possible to choose between four different
addresses simply by setting this pin at one of the four fixed
voltage levels, as shown in Table 19.
I
2
C Electrical Characteristics
I
2
C Bit Description
TABLE 19. ADDRESS PIN CHARACTERISTICS
V
ADDR
ADDR1 ADDR0
V
ADDR
-1
“0001000”
00
V
ADDR
-2
“0001001”
01
V
ADDR
-3
“0001010”
10
V
ADDR
-4
“0001011”
11
TABLE 20. I
2
C SPECIFICATIONS
PARAMETER TEST CONDITION MIN TYP MAX
Input Logic High, VIH SDA, SCL 2.0V
Input Logic Low, VIL SDA, SCL 0.8V
Input Logic Current, IIL SDA, SCL;
0.4V < V
DD
< 3.3V
10A
Input Hysterisis SDA, SCL 165mV 200mV 235mV
SCL Clock Frequency 0 100kHz 400kHz
TABLE 21.
BIT NAME DESCRIPTION
EN1, EN2 ENable output for Channels 1 and 2
VTOP1, VTOP2 Voltage TOP Select ie 18V/19V for Channels 1 and 2
VBOT1, VBOT2 Voltage BOTtom Select, i.e. 13V/14V for Channels 1 and 2
ENT1, ENT2 ENable Tone for Channels 1 and 2
MSEL1, MSEL2 Modulation SELect for Channels 1 and 2
TFR1, TFR2 Tone Frequency and Rise time select for Channels 1 and 2
DCL1, DCL2 Dynamic Current Limit select for Channels 1 and 2
VSPEN1, VSPEN2 Voltage Select Pin ENable for Channels 1 and 2
ISELH1, SELH2 and ISELL1,
ISELL2, ISEL1R, ISEL2R
Current limit “I” SELect High and Low bits for Channels 1 and 2
OTF Over-Temperature Fault bit
CABF1, CABF2 CABle Fault or open status bit for Channels 1 and 2
OUVF1, OUVF2 Over and Undervoltage Fault status bit for Channels 1 and 2
OLF1, OLF2 Over Load Fault status bit for Channels 1 and 2
BCF1, BCF2 Backward Current Fault bit for Channels 1 and 2
TTH1, TTH2 Tone THreshold is the OR of the signal pin TXT1, TXT2
ISL6422B
