Datasheet
MAX1253/MAX1254
Stand-Alone, 10-Channel, 12-Bit System Monitors
with Internal Temperature Sensor and V
DD
Monitor
______________________________________________________________________________________ 15
Manually Triggered Conversion
(Command Code = 0000)
Before beginning a manual conversion, ensure the
scan mode bit in the setup register is zero, because a
logic 1 disables manual conversions. The address bits
in a Manually Triggered Conversion command select
the input channel for conversion (see Table 3). When
performing a differential conversion, use the even chan-
nel address (AIN0, AIN2, AIN4, AIN6); the command is
ignored if odd channel addresses (AIN1, AIN3, AIN5,
AIN7) are used for a differential conversion.
After issuing a Manually Triggered Conversion com-
mand, bring CS high to begin the conversion. To obtain
a correct conversion result, CS must remain high for a
period longer than the reference power-up time (if in
power-down mode) plus the conversion time for the
selected channel configured conversion type (voltage
or temperature). The conversion’s result can then be
read at DOUT by issuing a Read Current Data Register
for Selected Channel command, addressing the con-
verted channel. See Table 3 for channel addresses.
Table 2. Command Description
DATA BYTES AFTER
COMMAND WORD
COMMAND
WORD
BYTES TO
DIN
BYTES
FROM DOUT
COMMAND DESCRIPTION
0000#### 0 0 Manually Trigged Conversion
0001xxxx 0 3 Read Alarm Register
0010#### 0 2 Read Current Data Register for Selected Channel
0011#### 0 20 Read Current Data Register for All Channels
0100#### 0 5 Read Configuration Register for Selected Channel
0101xxxx 0 5 Read Global Configuration Registers
0110xxxx N/A N/A Reserved
0111xxxx 0 0 Reset
1000#### 0 0 Clear Alarm/Fault for Selected Channels
1001xxxx 0 0 Clear Alarm/Fault for All Channels
1010#### 2 0 Write Current Data Register for Selected Channel
1011xxxx 20 0 Write Current Data Registers for All Channels
1100#### 5 0 Write Configuration Registers for Selected Channel
1101xxxx 5 0 Write Global Configuration Registers
1110xxxx N/A N/A Reserved
1111xxxx N/A N/A Reserved
#### = Channel address code, see Table 3.
xxxx = These bits are ignored for this command.
Table 3. Channel Address
ADDRESS IN COMMAND INPUT
0000 Internal temperature
0001 VDD
0010 AIN0
0011 AIN1
0100 AIN2
0101 AIN3
0110 AIN4
0111 AIN5
1000 AIN6
1001 AIN7
1010 Reserved
1011 Reserved
1100 Reserved
1101 Reserved
1110 Reserved
1111 Reserved