Datasheet

MAX13335E/MAX13336E
Dual Automotive Differential Audio Receivers
with I
2
C Control and Diagnostics
20
Gain Register (GAIN)
Bits 7 to 0: G_
The Gain register sets the gain of the internal programmable gain amplifier (A
V
) for the left (GL[3:0]) and right (GR[3:0])
channels. The gain of the programmable gain amplifier (A
V
) is determined by the following transfer function:
Gain(A
V
) = -14dB + (G_[3:0] x 2)dB (for MAX13335E)
Gain(A
V
) = -22dB + (G_[3:0] x 2)dB (for MAX13336E)
Diagnostic Configurations
The device’s diagnostics can be configured for local jack
sense, remote jack sense, and differential drive connec-
tions (see the Typical Application Circuits). Diagnostic
registers DIAG0 and DIAG1 configure the diagnostic I/O
ports D_ as a current-source output with voltage sensing
enabled, a voltage sensing input, or a diode to GND.
When voltage sensing is enabled, the current states of
the internal window comparator are updated to status
register STAT0. A valid readout of the STAT0 register
might require some amount of delays (to be inserted by
the microcontroller) between configuring the diagnostic
and reading the status register due to the settling time
needed to charge/discharge the external capacitive load
on the D_ pins.
Local Jack Sense
The device is configured for jack sense function when the
jack is localized to the same module. In this application
example, the diagnostic I/O D1 is configured as a 97FA
current-source output and D0 is configured for voltage
sensing. When a plug is not inserted, the internal spring
contact of the jack shorts D1 to D0. The 97FA current
source from D1 pulls D0 to V
DD
resulting in DH0 = 1.
When a plug is inserted, the internal spring contact of
the jack is forced open and disconnects D1 from D0. This
results in D0 going low and hence DH0 = 0.
Remote Jack Sense Detection
When the jack is remotely located, the device can be
used for additional fault detection of the wiring harness
used for the connection. See the Typical Application
Circuits.
Differential Connection
For fully differential applications, the device can be con-
figured to detect faults in the wiring harness as shown in
the Typical Application Circuits.
Table 4. Local Jack Sense Diagnostic Configuration
ADDRESS: 0x06
MODE: R/W
BIT 7 6 5 4 3 2 1 0
NAME
GL3 GL2 GL1 GL0 GR3 GR2 GR1 GR0
POR
0 0 0 0 0 0 0 0
CONFIGURATION FUNCTION COMPARATOR OUTPUT STATUS
D1[3:0] = 0010
D0[3:0] = 1110
Source 97FA
Source off
DH0 = H Device not plugged in
D1[3:0] = 0010
D0[3:0] = 1110
Source 97FA
Source off
DH0 = L Device plugged in