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参数资料
| 型号： | MAX13037ATX+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/22页 |
| 文件大小： | 0K |
| 描述： | IC AUTO CONTACT MONITOR 36-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 自动 |
| 接口： | SPI |
| 电源电压： | 6 V ~ 26 V |
| 封装/外壳： | 36-WFQFN 裸露焊盘 |
| 供应商设备封装： | 36-TQFN 裸露焊盘（6x6） |
| 包装： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
MAX13037/MAX13038
Automotive Contact Monitor and
Level Shifters with LDO Regulator
12
______________________________________________________________________________________
BAT
BAT is the main power-supply input. Bypass BAT to
ground with a 0.1F ceramic capacitor placed as close
as possible to BAT. In addition, bypass BAT with a
10F or greater capacitor. BAT can withstand DC volt-
ages up to +42V.
Low-Dropout Linear Regulator (VLO)
The MAX13037/MAX13038 contain an internal LDO lin-
ear regulator supplied by the BAT input. The LDO out-
put voltage is present on VLO and is capable of
supplying up to 150mA of current. The MAX13037 out-
put voltage is set to +5V and the MAX13038 output
voltage is set to +3.3V.
The LDO regulator is controlled through the
REGON
and
REGOFF inputs as shown in Figure 4. REGON is
an input able to withstand voltages up to VBAT. The
LDO startup time is 1ms (typ).
There are two options for controlling the linear regulator:
Wake-Up on Interrupt: In this case,
REGON is con-
nected to
INT and when the MAX13037/MAX13038
generate an interrupt, the linear regulator is turned
on, thus providing power to the local Cs. The C
pulls
REGOFF high to keep the regulator on before
making an SPI read (which causes
INT and REGON
to go high). The linear regulator can then be turned
off by pulling
REGOFF low.
Direct Control: In this case, the regulator is
enabled/disabled by some other signal in the sys-
tem which must be connected to
REGON. If
REGOFF is not used, it must be connected to GND
to allow the turnoff of the LDO.
Linear Regulator Wake-Up
Regulator wake-up can be controlled with the
INT out-
put by connecting it to
REGON. REGON is a TTL input
with an internal pullup to a low-voltage internal refer-
ence of +4.8V (typ). With this control scheme, any
change of the input switches (enabled for interrupt gen-
eration) causes the regulator to turn on, thus providing
power to any external circuitry connected to VLO. If an
external microcontroller is supplied from VLO, the
microcontroller can keep the LDO on by forcing
REGOFF high. Reading from the MAX13037/MAX13038
over the SPI interface causes the
INT output to go into
high-impedance so that both
INT and REGON are
pulled high. After this phase, the microcontroller can
turn off the regulator again by driving
REGOFF low.
Note that it is also possible to tie multiple open-drain
active-low outputs in an ORing configuration, allowing
the wakeup of the regulator from other devices.
If the
INT output is not used to control the regulator,
connect the
REGOFF input to ground and use REGON
to enable or disable the regulator as shown in Figure 4.
Watchdog Timer (WDI)
The MAX13037/MAX13038 feature a watchdog timer
that is reset on every transition on the WDI input. If
there is no transition on WDI before the first timeout
period (tWD1) the INT output asserts low. If there is still
no transition on WDI after the second timeout period
(tWD2), the RST output is pulsed low for tRST and the
INT output deasserts (see Figure 3). The watchdog
timeout period can be adjusted by changing the
capacitor value on the TD input.
tRST (ms) = 2 x CTD (nF)
tWD1 = 4 x tRST (ms)
tWD2 = 8 x tRST (ms)
Note that WDI can be tied to the
CS input to allow a
watchdog reset for every read/write operation over the
SPI interface. To avoid any corruption of the internal
command register, it is necessary to transmit the full pro-
gramming word (16 bits) for every
CS negative pulse.
Reset Output (
RST)
The
RST output asserts low when a watchdog timeout
occurs or when the LDO output voltage drops below a
certain threshold. The threshold voltage is set by con-
necting an external voltage divider on the THRESH
input between VLO and GND. The voltage on THRESH
is compared with an internal reference voltage of
+1.24V and if it is lower, the
RST output asserts low
for tRST and remains low if VLO does not rise above
the threshold.
REGOFF = 1
REGOFF = 0
LDO ON
REGON = 0
REGOFF = 0
LDO ON
REGON = 0
REGOFF = 1
LDO ON
REGON = 1
REGOFF = 1
LDO OFF
REGON = 1
REGOFF = 0
REGON = 1
REGON = 0
REGON = 1
REGOFF = 1 IS NOT ALLOWED
BECAUSE VLO IS ABSENT.
Figure 4. Linear Regulator State Diagram
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相关代理商/技术参数 |
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|---|---|
| MAX13038ATI+ | 功能描述:接口 - 专用 Auto Contact Monitor & Level Shift w/LDO RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59 |
| MAX13038ATI+T | 制造商:Maxim Integrated Products 功能描述:AUTOMOTIVE CONTACT MONITOR AND LEVE - Tape and Reel |
| MAX13038ATX+ | 功能描述:接口 - 专用 Auto Contact Monitor & Level Shift w/LDO RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59 |
| MAX13038ATX+T | 功能描述:接口 - 专用 Auto Contact Monitor & Level Shift w/LDO RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59 |
| MAX1303AEUP | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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