MAX1455AAE-T Maxim Integrated Products, MAX1455AAE-T Datasheet - Page 14

• Manufacturer Part Number: MAX1455AAE-T
• Description: Board Mount Temperature Sensors Automotive Sensor Signal Conditioner
• Manufacturer: Maxim Integrated Products

Specifications of MAX1455AAE-T

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Low-Cost Automotive Sensor Signal
Conditioner
Figure 4 shows an example transmit/receive sequence
with the RDIRS command (59hex) being sent and the
MAX1455 responding with a byte value of 10hex.
Following initial power-up, or after a power reset, all of
the calibration registers within the MAX1455 contain
0000hex and must be programmed. Note that in analog
14
Figure 5. MAX1455 Serial Command Structure and Hardware Schematic
______________________________________________________________________________________
DIO
TABLE 9. INTERFACE REGISTER
IRS COMMAND (8 BITS)
IRSA [3:0] IRSD [3:0]
1100 TO
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1110
1111
SET COMMANDS
Internal Clock Settings
DHR [15:12]
DHR [11:8]
(EXECUTE)
BAUD RATE
RESERVED
RESERVED
ALOC [3:0]
RESERVED
ICRA [3:0]
IRSP [3:0]
CRIL [3.0]
ATIM [3:0]
DHR [3:0]
DHR [7:4]
IEEA [3:0]
IEEA [7:4]
IEEA [9:8]
RELEARN
TABLE 11. IRS POINTER FUNCTIONS (READS)
IRSP [3:0]
1010 TO
1000
1001
0110
0111
1111
0000
0001
0010
0011
0100
0101
BIDIRECTIONAL
CHECK COMMUNICATION)
16-BIT
LATCH
DATA
CRIL [3:0]
ALOC [3:0], ATIM [3.0]
IEEA [7:4], ICRA [3:0]
CRIL [3:0], IRSP [3:0]
11001010 - (USE TO
1000 TO
TEMP-INDEX [7:0]
0110
0111
1111
0000
0001
0010
0011
0100
0101
TABLE 10. CRIL ACTIONS
BITCLK [7:0]
RETURNS
RESERVED
TABLE 16. INTERNAL CALIBRATION
DHR [7:0]
DHR [F:8]
IEEA [7:0]
IEED [7:0]
ICRA [3:0] CALIBRATION REGISTER
0101 TO
0000
0001
0010
0011
0100
1111
DHR [7:0]
DHR [15:8]
ERASE EEPROM
WRITE EEPROM
READ EEPROM
REGISTERS
ANALOG OUT
ERASE PAGE
FUNCTION
RESERVED
LOAD ICR
READ ICR
READ IRS
mode, the internal registers are automatically refreshed
from the EEPROM.
When starting the MAX1455 in digital mode, pay spe-
cial attention to the 3 CLK bits: 3MSBs of the
Configuration register. The frequency of the MAX1455
internal oscillator is measured during production testing
and a 3-bit adjustment (calibration) code is calculated
FSOTCDAC
RESERVED
OTCDAC
FSODAC
CONFIG
ODAC
ENABLE ANALOG OUTPUT
PGA
TEMP INDEX [7:0]
OUTPUT
OUTPUT
ADDR
TIMER
MUX
768
ADDRESS
MEMORY
EEPROM
LOOKUP
X
8 BITS
DATA
OUT