ST8024LTR STMicroelectronics, ST8024LTR Datasheet - Page 22

• Manufacturer Part Number: ST8024LTR
• Description: Interface - Specialized Smart card interface 3V or 5V 26 MHz
• Manufacturer: STMicroelectronics

Specifications of ST8024LTR

• Product Category: Interface - Specialized
• Rohs: yes
• Product Type: Smart Card Interface
• Operating Supply Voltage: 2.7 V to 6.5 V
• Supply Current: 1.2 mA
• Maximum Power Dissipation: 0.56 W
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TSSOP-20
• Minimum Operating Temperature: - 25 C

Functional description
Note:
Table 22.
Figure 5.
22/35
The clock may be applied to the card using the following sequence (see
If the applied clock is not needed, then CMDVCC may be set low with RSTIN low. In this
case, CLK starts at t
be set high in order to obtain an “answer to request” (ATR) from the card.
Activation should not be performed with RSTIN held permanently high.
It is recommended that no control smartcard signals are to be shared with any other
devices. Sharing may result in inadvertent activation or deactivation of the smartcard.
Card presence indicator
Activation sequence using RSTIN and CMDVCC
OFF
H
L
1. Set RSTIN high.
2. Set CMDVCC low.
3. Reset RSTIN low between t
4. RST remains low until t
5. After t
pulses before toggling RST.
5
, RSTIN has no further affect on CLK; this allows a precise count of CLK
3
(minimum 200 ns after the transition on I/O), and after t
Doc ID 17709 Rev 5
5
, when RST is enabled to be the copy of RSTIN.
CMDVCC
3
and t
H
H
5
; CLK starts at this moment.
Card not present
Card present
Indication
Figure
5
, RSTIN may
5):
ST8024L