MAX14521E Datasheet, PDF (12/20 Pages) Maxim Integrated Products – Quad, High-Voltage EL Lamp Driver with I2C Interface

Quad, High-Voltage EL Lamp Driver
with I²C Interface
Slave Address
The MAX14521E device address is set through external
inputs. The slave address consists of five fixed bits
(B7–B3, set to 11110) followed by two input program-
mable bits (A1 and A0).
For example: If A1 and A0 are hardwired to ground,
then the complete address is 1111000. The full address
is defined as the seven most significant bits followed by
the read/write bit. Set the read/write bit to 1 to configure
the MAX14521E to read mode. Set the read/write bit to
0 to configure the MAX14521E to write mode. The
address is the first byte of information sent to the
MAX14521E after the START condition.
System Registers (0x00, 0x01)
Device ID (DEVID3/DEVID2/DEVID1/DEVID0)
DEVID[3:0] is preprogrammed to 1011 to identify the
MAX14521E; see Table 2.
Revision (REV3/REV2/REV1/REV0)
REV[3:0] is preprogrammed to the current revision of
the MAX14521E and is REV[3:0] = 0010.
System Overtemperature (OVRTEMP)
1 = Thermal shutdown temperature exceeded.
0 = Analog circuitry operating properly.
OVRTEMP = 1 turns the EL outputs off. To set
OVRTEMP to 0 and restart in default condition (all regis-
ter reset), the user must place RB = 0.
1 = EL outputs enabled.
System Enable (EN)
0 = EL outputs disabled.
EN = 1 places the MAX14521E in a normal operating
mode. Register contents are restored to values prior to
shutdown. EN = 0 disables the EL outputs and places
the device in a low-power shutdown state.
EL Frequency Register (0x02)
EL Frequency (FEL[7:0])
FEL[7:6] sets the EL frequency range of all EL outputs
and FEL[5:0] sets the EL frequency within the frequen-
cy range; see Table 4. FEL[5:0] = 000000 sets the fre-
quency to the minimum value of the frequency range.
FEL[5:0] = 111111 sets the frequency to the maximum
value of the frequency range. EL frequency increases
linearly with FEL[5:0]; see Table 3.
Table 2. Device Identification, Status, and Enable
REGISTER
B7
B6
B5
B4
0x00
DEVID3 DEVID2 DEVID1 DEVID0
0x01
OVRTEMP
X
X
X
X = Don’t Care
B3
REV3
X
B2
REV2
X
B1
REV1
X
B0
REV0
EN
Table 3. EL Output Frequency
REGISTER
B7
B6
0x02
FEL7
FEL6
B5
FEL5
B4
FEL4
B3
FEL3
B2
FEL2
B1
FEL1
B0
FEL0
Table 4. EL Frequency Range
FEL[7:6]
EL FREQUENCY RANGE (Hz)
00
50–100
01
100–200
10
200–400
11
400–800
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