TDA8002C Datasheet, PDF (14/28 Pages) NXP Semiconductors – IC card interface

Philips Semiconductors
IC card interface
Product specification
TDA8002C
DEACTIVATION SEQUENCE
When a session is completed, the microcontroller sets the
CMDVCC line to HIGH state or MODE line to LOW state.
The circuit then executes an automatic deactivation
sequence by counting the sequencer down and thus end
in the Idle mode.
Figures 13 and 14 illustrate the deactivation sequence as
follows:
1. RST goes LOW (t₁₁ ≈ t₁₀)
2. CLK is stopped (t₁₂ = t₁₁ + ¹â„₂T)
3. I/O, AUX1 and AUX2 fall to zero (t₁₃ = t₁₁ + T)
4. V_CC falls to zero (t₁₄ = t₁₁ + 1¹â„₂T); a special circuit
ensures that I/O remains below V_CC during the falling
slope of V_CC
5. VUP falls (t₁₅ = t₁₁ + 5T).
handbook, full pagewidth
OSC_INT/64
CMDVCC
VUP
VCC
I/O
CLK
RSTIN
RST
tde
t10
t15
t14
t13
LOW
t12
t11
Fig.13 Deactivation sequence
FCE479
1999 Oct 12
14