参数资料
型号: NCN6004AFTBR2G
厂商: ON Semiconductor
文件页数: 27/40页
文件大小: 0K
描述: IC INTERFACE SAM/SIM DUAL 48TQFP
标准包装: 1
应用: PC,PDA
接口: 微控制器
电源电压: 1.8 V ~ 5.5 V
封装/外壳: 48-TQFP 裸露焊盘
供应商设备封装: 48-TQFP(7x7)
包装: 标准包装
安装类型: 表面贴装
其它名称: NCN6004AFTBR2GOSDKR
NCN6004A
http://onsemi.com
33
NOTE:
Both sides of the interface run with open drain load
(worst case condition)
Figure 34. Typical I/O Rise and Fall Time
ESD Protection
The NCN6004A includes silicon devices to protect the
pins against the ESD spikes voltages. To cope with the
different ESD voltages developed across these pins, the built
in structures have been designed to handle either 2 kV, when
related to the microcontroller side, or 8 kV when connected
with the external contacts. Practically, the CRD_RST,
CRD_CLK, CRD_IO, CRD_C4 and CRD_C8 (both A and
B sections) pins can sustain 8 kV, the maximum short circuit
current being limited to 15 mA. The CRD_VCC_A and
CRD_VCC_B pins have the same ESD protection, but can
source up to 65 mA continuously each, the absolute
maximum current being 150 mA per section.
Security Features
In order to protect both the interface and the external smart
card, the NCN6004A provides security features to prevent
catastrophic failures as depicted here after.
Pin Current Limitation: in case of a short circuit to
ground, the current forced by the device is limited to 10 mA
for any pins, except CRD_CLK_A and CRD_CLK_B pins
which are both limited to 70 mA. No feedback is provided
to the external MPU.
DC/DC Operation: The internal circuit continuously
senses the CRD_VCC_A and CRD_VCC_B voltages and,
in the case of either over or under voltage situation, update
the STATUS register accordingly. This register can be read
out by the MPU but no interrupts are activated.
DC/DC Overload: When an overload is sensed across the
CRD_VCC_A or CRD_VCC_B output, during either the
power on sequence or when the system was previously
running, the NCN6004A generates an interrupt by pulling
down the INT pin. It is up to the microcontroller to identify
the origin of the overload by reading the STATUS pin
accordingly.
Battery Voltage: Both the Positive going and the
Negative going voltage are detected by the NCN6004A, a
POWER_DOWN sequence and the STATUS register being
updated accordingly. The external MPU can read the
STATUS pin to take whatever is appropriate to cope with the
situation. The NCN6004A does not provide any further
internal voltage regulation.
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