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PDF MAX13037 Data sheet ( Hoja de datos )
| Número de pieza | MAX13037 | |
| Descripción | (MAX13037 / MAX13038) Automotive Contact Monitor and Level Shifters | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-1084; Rev 0; 11/07
Automotive Contact Monitor and
Level Shifters with LDO Regulator
General Description
The MAX13037/MAX13038 automotive contact monitor
and level shifters monitor and debounce eight remote
mechanical switches and assert an interrupt (INT) if a
switch changes state. The state of each switch is sam-
pled through an SPI™ interface by reading the status
register. Any switch can be prohibited from asserting an
interrupt by writing to the command register. Four of the
switch inputs are intended for ground-connected
switches (IN0–IN3) and the other four inputs (IN4–IN7)
are programmable in groups of two for either ground-
connected or battery-connected switches. Two switch
inputs (IN0, IN1) have direct level-shifted outputs (DO0,
DO1) to be used for PWM or other timing-based signals.
Switch input thresholds are set to 50% of the voltage
applied to BATREF. The threshold hysteresis is set by
connecting an external resistor from HYST to ground.
The MAX13037/MAX13038 supply an adjustable wet-
ting current to each closed switch to clean mechanical
switch contacts that are exposed to adverse conditions.
The MAX13037/MAX13038 feature a low dropout (LDO)
linear regulator capable of supplying up to 150mA of
current. The MAX13037 LDO has an output voltage of
+5V, whereas the MAX13038 has an output voltage of
+3.3V. The MAX13037/MAX13038 also feature a watch-
dog timer and an open-drain reset output with
adjustable timing.
The MAX13037/MAX13038 operate with a +6V to +26V
battery voltage applied to BAT. The MAX13037/
MAX13038 are available in a 6mm x 6mm, 36-pin TQFN
package and operate over the automotive -40°C to
+125°C temperature range.
Applications
Body Computers
Window Lifters
Seat Movers
Electric Sunroofs
Other Control ECUs
SPI is a trademark of Motorola, Inc.
Features
o +6V to +26V Operating Voltage Range
o +42V Compatibility on BAT
o Switch Inputs Withstand Reverse Battery
o 150mA LDO, +5V (MAX13037) or +3.3V
(MAX13038)
o Ultra-Low Operating Current 28µA (typ) in 64ms
Scan Mode with LDO ON
o Resistor Adjustable Switching Hysteresis
o Watchdog and Reset
o Built-In Switch Debouncing
o Interrupt Output
o Immunity to Transients
o High Modularity
o Thermal Protection
o ±8kV HBM ESD Protection on IN0–IN7 Without
External Components
o Two Inputs (IN0, IN1) Programmable as Direct
Outputs
o Four Inputs (IN4–IN7) Programmable for BAT or
GND Related Switches
Ordering Information
PART
LDO
OUTPUT
TEMP
PIN-
VOLTAGE RANGE PACKAGE
PKG
CODE
MAX13037ATX+
+5V
-40°C to
+125°C
36 TQFN-EP*
(6mm x
6mm)
T3666-3
MAX13038ATX+
+3.3V
-40°C to 36 TQFN-EP*
+125°C
(6mm x
6mm)
T3666-3
+Denotes a lead-free package.
*EP = Exposed paddle.
Pin Configuration and Typical Application Circuit at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
www.DataSheet4U.com
Automotive Contact Monitor and
Level Shifters with LDO Regulator
TIMING CHARACTERISTICS (continued)
(BAT = +6V to +26V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at BAT = +14V, TA = +25°C.) (Note 2)
PARAMETER
SDI to Falling Edge of CLK
Required Setup Time
Falling Edge of CLK to SDI
Required Hold Time
Time from Falling Edge of CS to
SDO Low Impedance
Time from Rising Edge of CS to
SDO High Impedance
Time from Rising Edge of CLK to
SDO Data Valid
Debounce Time
Scanning Time Pulse
Scanning Time Period
Wetting Time Pulse
Time from Shutdown to Normal
Operation
Time from SCAN Mode to Normal
Operation
Reset Output Pulse Width
Watchdog Timeout Period 1
Watchdog Timeout Period 2
Minimum Watchdog Timeout
Reset on WDI
SYMBOL
CONDITIONS
tSI(SU) Input rise/fall time < 2ns, Figure 1
tSI(HOLD) Input rise/fall time < 2ns, Figure 1
tSO(EN) Input rise/fall time < 2ns, Figure 1
tSO(DIS) Figures 1 and 2
tVALID
tDEB
tSCAN
tSCAN-P
tWETT
tSD
CSDO =15pF, Figure 1
CTDEB = 500pF
CTDEB = 10nF
SC0 = 0, SC1 = 1, SC2 = 1
WTOFF = 0
SD low-to-high transition to input monitoring
enabled
tSM
tRST
tWD1
tWD2
(Note 8)
CTD = 10nF (Figure 3)
CTD = 10nF, time before INT goes low
(Figure 3)
CTD = 10nF, time before RST goes low
(Figure 3)
tWDI
MIN TYP MAX
30
20
55
55
70
3.18 5.9 9.42
63 120 188
130 250 400
4 8 14
10 21 35
200
500
10 21 36
40 84 144
2 x tWD1
300
UNITS
ns
ns
ns
ns
ms
ms
ms
µs
ms
ms
µs
µs
ms
ms
ms
ns
Note 2: All units are 100% production tested at TA = 125°C. Limits over the operating temperature range are guaranteed by design and
not production tested.
Note 3: VTH_C = (VTH_HIGH + VTH_LOW) / 2.
Note 4: VTH_HYS = (VTH_HIGH - VTH_LOW).
Note 5: Wetting current rise/fall time is measured as the time it takes to go from 20% to 80% of the maximum wetting current.
Note 6: TSHDN is the temperature at which the wetting currents and LDO are disabled.
Note 7: TWARN is the temperature at which only the wetting currents are disabled.
Note 8: When exiting SCAN mode to enter Normal Mode (through SPI) any input change is ignored for 500µs (typ) to allow correct
wake-up of input comparators. After this time elapses, the inputs are monitored in continuous mode.
_______________________________________________________________________________________ 5
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REGON
REGOFF
BATREF
IN0
IN1
IN2
IN3
IN4
IN5
IN6
IN7
Automotive Contact Monitor and
Level Shifters with LDO Regulator
Functional Diagram
SD BAT
MAX13037
MAX13038
WAKE-UP
LOGIC
WETTING
CURRENT
CONTROL
LEVEL
TRANSLATORS
LINEAR
REGULATOR
RESET +
WATCHDOG
SPI
INTERFACE
SHIFT
REGISTER
INTERRUPT
LOGIC
DIGITAL
INTERFACE
VLO
WDI
THRESH
TD
DO0
DO1
CS
CLK
SDI
SDO
INT
RST
OT
WET HYST TDEB
GND
Detailed Description
The MAX13037/MAX13038 automotive contact monitor
and level shifters monitor and debounce eight remote
mechanical switches and assert an interrupt (INT) if a
switch changes state. Any of the switch inputs can be
prohibited from asserting an interrupt. The switch
threshold levels are set to 50% of the voltage applied to
BATREF and all switch inputs feature a common
adjustable hysteresis, debounce time, and wetting cur-
rent. Two switch inputs (IN0, IN1) are programmable to
have direct outputs (DO0, DO1), useable for PWM or
other timing-based signals.
The MAX13037/MAX13038 feature an SPI interface to
monitor individual switch inputs and to configure inter-
rupt masking, hysteresis, and wetting current
enable/disable, switch configuration (battery-
connected or ground-connected), and scanning period.
The MAX13037/MAX13038 provide an internal low
dropout (LDO) linear regulator capable of supplying up
to 150mA. The LDO can be enabled or disabled
through two digital control inputs: REGON and REGOFF.
A watchdog timer and power-on reset circuitry is provid-
ed on the MAX13037/MAX13038 to supervise external
microcontrollers (µC).
The MAX13037/MAX13038 feature three modes of
operation: normal mode, scanning mode, and shut-
down mode. In normal mode, the part is fully functional
and internal sensing resistors are connected to all
switch inputs. In scanning mode, the sensing resistors
are connected for a finite duration to reduce power
consumption. In shutdown mode, all switch inputs are
high impedance and the internal LDO is switched off to
further reduce power consumption.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet MAX13037.PDF ] | |
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