MAX14502AETL+ Maxim Integrated Products, MAX14502AETL+ Datasheet - Page 25

• Manufacturer Part Number: MAX14502AETL+
• Description: IC CARD READER USB-SD 40-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Smart Card Interface ICr

Specifications of MAX14502AETL+

• Applications: USB
• Interface: I²C
• Voltage - Supply: 1.8 V ~ 3.3 V
• Package / Case: 40-TQFN Exposed Pad
• Mounting Type: Surface Mount
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

In simple control, the BERR/INT output functions as
BERR and indicates if an error occurs during Card
Reader mode. If BERR asserts low to indicate an error,
the MAX14500–MAX14503 stay in Card Reader mode.
If the error clears, data transfer begins. BERR asserts if
KVBUS, V
ed that MODE be pulled low when BERR indicates an
error to return the MAX14500–MAX14503 to Pass Thru
mode for the host µP to clear the error.
In I
put (INT) and asserts for errors encountered in Card
Reader mode when interrupts are not masked. To find
the source of the interrupt, read the interrupt request
registers and status register.
Figure 11. I2C_SEL is connected low to enable simple control and MODE = 1 to enable Card Reader mode for SD card 1.
2
C control, BERR/INT functions as an interrupt out-
CONNECTOR
TM
SLOT 1
USB
SD
, or V
D+
D-
SD
______________________________________________________________________________________
4
are not present. It is recommend-
CCRD_PRST
CCLK1
CCMD1
CDAT1_[3:0]
CD+
CD-
Error Checking
TRANSCEIVER
SD CARD INTERFACE
USB
CARD READER
USB HS
USB SWITCHES
Hi-Speed USB-to-SD Card
The BUSY output is used in simple control and I
trol to indicate when Card Reader mode is active. In
simple control, transitioning MODE high to low requests
the internal microcontroller to enable Pass Thru mode.
BUSY asserts low while in Card Reader mode and
deasserts high in Pass Thru mode.
The BSY bit in STATUS1 (0x12) behaves similarly with
I
bit. Requests to put the device to sleep or bypass
(Pass Thru mode) while in Card Reader mode can be
verified by checking the state of the BUSY signal or
BSY bit. The BUSY output indicates the status of the
BUSY flag in STATUS1. The BSY bit is 1 when the
BUSY output asserts low. When enabled, changes in
the busy flag cause an interrupt. In I
the BSY bit or the BUSY output give the status of the
busy state.
MAX14500–
SD PORT 1 SWITCHES
2
MAX14503
C control. The BUSY output is represented by the BSY
Readers with Bypass
HDAT1_[3:0]
HCRD_PRST
I2C_SEL = LOW
MODE = HIGH
HCMD1
HCLK1
BUSY
BERR
HD+
HD-
4
PORT1
HOST
USB
SD
HOST PROCESSOR
I/O
Busy Indication (BSY)
2
C control, either
2
C con-
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